Dermatology Flashcards

1
Q

Eccrine Glands

A

A type of sweat gland
opens directly onto skin
regulates body temperature through sweat

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2
Q

Apocrine Glands

A
A type of sweat gland 
opens directly into hair follicles 
found in axillae and anogenital areas 
becomes active during puberty, decrease in aging adult 
produce body odor
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3
Q

ABCDE Rule

A
For nevi 
A - asymmetry 
B - borders (regular vs irregular) 
C - color (uniformity; tan, black, blue, red) 
D - diameter (>6mm) 
E - evolution or elevation
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4
Q

Secondary Skin Lesion

A

Later evolution or result of external trauma to the primary lesion

ex. 
Erosion 
Ulcer
Fissure 
Excoriation 
Atrophy 
Scaling 
Crusting
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5
Q

Most common types of skin cancer arise from which skin layer?

A

Epidermis

Remember the layers by “Come Lets Get Sun Burnt”

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6
Q

What are the two main cell types in epidermis?

A

Keratinocyte - (epithelial cells) starts out in the basal cell membrane and differentiates all the way to the corneum (dead cell layer) —keratinocyte carcinoma
Melanocyte - pigment cells - located in between the dermis and epidermis –melanoma

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7
Q

What is the difference between BCC and SCC?

A

Both types of keratinoctye carcinomas
Basal Cell Carcinoma - cancer originating from the stratum basale (or the basal cell layer)

Squamous Cell Carcinoma - cancer originating from corneum, lucidum, granulosum, or spinosum

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8
Q

Which type of skin cancer is most common?

A

Keratinocyte carcinomas (SCC, BCC) making up ~97% of skin cancer

melanoma makes up about 2% of skin cancer but is much more deadly

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9
Q

Acanthosis

A

abnormal thickness of epidermis (relative to the location on the body)

diffuse epidermal hyperplasia

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10
Q

Invasive SCC

A

this means that the squamous cells have invaded based the basal membrane and into the dermis

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11
Q

Hyperkeratosis

A

thickening of stratum corneum by abnormal keratin

often associated with a qualitative abnormality of the keratin

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12
Q

Parakeratosis

A

Retention of nuclei in stratum corneum

normal in mucous membranes

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13
Q

Hypergranulosis

A

Hyperplasia of stratum granulosum, usually caused by intense rubbing

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14
Q

Papillomatosis

A

Hyperplasia and enlargement of contiguous dermal papillae leading to surface elevation

common wart

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15
Q

Dyskeratosis

A

Abnormal keratinization occurring prematurely in cells below stratum granulosum

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16
Q

Acantholysis

A

loss of intracellular connections causing loss of cohesion between keratinocytes

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17
Q

Spongiosis

A

epidermal intracellular edema

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18
Q

First Degree Burn

A

erythema, swelling

transitory, reversible

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19
Q

Second Degree Burn

A

Blisters involving epidermis

Hair follicles, adenxa in dermis spared

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20
Q

Third Degree Burn

A

Full-thickeness burns; massive necorsis of epidermis and parts of dermis, subcutis
cannot heal spontaneously

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21
Q

Macule

A

flat, smaller than 2cm (ex. freckle)

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22
Q

Patch

A

similar to macule but larger

flat >2cm

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23
Q

Papule

A

slightly elevated, smaller than 1 cm

ex. eczema caused by allergy

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24
Q

Nodule

A

similar to papule but greater than 1 cm
(slightly elevated)

ex. nevus

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25
Tumor
nodule greater than 5 cm
26
Vesicle
fluid-filled elevation of epidermis smaller than 1 cm ex. herpesvirus lesion on the lip
27
Bulla
vesicle measuring more than 1 cm (ex. burns)
28
Pustule
vesicle filled with pus (ex. impetigo)
29
Ulcer
defect of the epidermis (ex. syphilitic chancre)
30
Crust
skin defect covered with coagulated plasma ("scab")
31
Scales
Keratin layers covering skin as flakes or sheets; can be scraped away ex. psoriasis, seborrheic keratoiss
32
Squames
Large scales (ex. ichthyosis)
33
Excoritation
superficial skin defect caused by scratching
34
Fissure
sharp-edged defect extending deeper into dermis (ex. athlete's foot)
35
Orthokeratosis
hyperkeratosis with just keratin, no nuclei
36
Parakeratosis
hyperkeratosis with keratin and nuclei
37
Effects on skin from chronic sun exposure
hyperpigmentation atrophy of epidermis dermal connective tissue degeneration
38
Folliculitis
bacterial infection of the hair follicule
39
Acne vulgaris
infiltration and destruction of follicular epithelium by neutrophilic exudate
40
Where are fungal infections mc?
Keratin layer (dead tissues)
41
Verruca Vulgaris
Common Wart | on microscope -- papillomatosis
42
Auspitz sign
seen with psoriasis | bleeding points when scale is lifted from plaque d/t tortuous dilated vessels
43
What is the MC malignant skin tumor?
BCC most commonly located on the FACE
44
What are telltale signs of skin cancer?
persistent, nonhealing ulcer irregular shape friable (crumbles), bleeds, multicolored indurated (hardened) margins of an ulcer or tissue around it
45
Lentigo
macule or papule' pigmented but does not respond to sun
46
Junctional nevus
mole just in the epidermis
47
Compound nevus
mole in both epidermis and dermis layers
48
Clinical Warning Signs for Melanoma
change in color, size, or shape of preexisting mole (typically >10mm) itching or pain to nevus new pigmented lesion developed in adult life irregular notched borders variegation of color (black, brown, red, blue, and gray)
49
What is the most important prognostic factor in melanoma?
tumor thickness
50
Radial vs vertical growth phase of melanoma?
Radial = (epidermis) tendency of melanoma cells to grow horizontally along the epidermis (no metastatic potential) Vertical = (dermis) melanoma cells grow vertically in the deeper dermis with no maturation and acquire a metastatic potential
51
Onychogryphosis
hypertrophic nail | related to trauma
52
Koilonychia
thin and spoon nail | seen in Fe deficiency anemia
53
Onychomycosis
thicken, discolor, disfigure, and split nail, related to FUNGAL infection
54
Paronychia
soft tissue infection, pus formation around a fingernail
55
What is Impetigo?
superficial bacterial infection of the Epidermis | typically caused by a mix of staph and strep
56
How do people get impetigo?
minor breaks in the skin preexisting dermatoses Bites wounds, burns, ulcers HIGHLY contagious amongst close contacts
57
What is nonbullous impetigo?
"Classic impetigo" | Erythematous macules/papules that evolve into vesicles/pustules, rupture forming HONEY COLORED crusts
58
Where on the body is nonbullous impetigo most common?
face and extremities
59
Where on the body is bullous impetigo more common?
on the trunk and folds such as axillae
60
What is Ecthyma?
a type of impetigo that has extended into the dermis the lesions are now coagulated and less honey-colored crusts still considered a superficial infection since there is no systemic sxs will heal with scarring
61
How do you dx impetigo?
Clinical dx Microscope will help you determine if its staph or strep ``` Staph = clusters Strep = chains ```
62
What is the treatment for impetigo?
think if you want to go topical or oral depending on the extent of spread of infection Topical: Bactroban (Mupirocin) - covers MRSA too - 2% ointment Retapamulin (Altabax) 1% ointment (less commonly used) Oral: Cephalexin (Keflex) second gen that covers both gram - and + Clindamycin (covers MRSA) Staph only = dicloxacillin Augmentin (Amoxicillin - Clavulanate) -big guns
63
What is Erysipelas?
soft tissue infection involving the dermis and subcutaneous tissue and superficial lymphatics (similar to cellulitis) MC in young children and the elderly MC caused by Group A Strep (GAS)
64
How does erysipelas present?
actue painful onset edematous, red, warm plaques with clear borders MC on cheeks and ears (can also be seen on extremities but less common) fever, chills, regional lymphadenopathy
65
What is the treatment for erysipelas?
outpt with oral ABX remember you are doing broad spectrum to cover for both erysipelas and cellulitis PCN (500mg every 6 hours) Amoxicillin (500mg every 8 hours) Keflex (250-500mg every 6 hours)
66
How does the age distribution differ between cellulitis and erysipelas?
Erysipelas is bimodal (young and old) | Cellulitis is MC in middle-aged, elderly, and immunocompromised
67
Pasteurella multocida
organism responsible for cellulitis secondary to dog or cat bites
68
IV Drug users are more likely to get cellulitis secondary to what bacteria?
Staph Aureus
69
If you are palpating a pt you suspect having cellulitis and you hear crunching, what pathogen should you be thinking about?
Clostridia | Crepitant cellulitis
70
Haemophilus influenzae causing cellulitis commonly presents where on the body?
face and periorbital
71
What is the clinical manifestation of cellulitis?
abrupt or gradual onset swelling, erythema, tenderness, and warmth (may also have bulla, vesicles, necrosis) Borders are rough and less defined - expanding Lower extremities MC location Fever, chills, malaise, anorexia, lymphadenopahty, lymphagitis can lead to sepsis
72
What is lymphagitis?
``` seen with cellulitis pts the red line showing the proximal spread of the infection this is a bad sign start on IV ABX right away this is a lymphatic spread ```
73
For which pts with cellulitis should you cover for Pseudomonas aeruginosa?
penetrating trauma ("stepped on a nail") immunocompromised hospitalized
74
What is the treatment for Cellulitis?
Keflex Augmentin (used for cat and dog bite - pasteurella) Dicloxacillin Clinda (MRSA) Cipro (puncture wounds d/t covering pseudomonas)
75
When should you be suspecting MRSA for a pt with cellulitis?
(this is important because you would normally be treating with keflex but if you suspect MRSA you will change to clinda or something else) ``` Penetrating trauma IV Drug Users Abscess/Purulent Drainage Hx of MRSA close contacts with MRSA pts recent ABX use Hospitalization ```
76
MRSA treatment
Oral: - Bactrim DS (double strength) - Doxycycline - Clinda - Linezolid IV: - Clinda - Linezolid - Vancomycin (not first line) - Daptomycin
77
What is folliculitis?
Inflammation of the superficial or deep portion of the hair follicle bacterial infection is MC cause
78
What is the MC bacteria responsible for folliculitis?
Staph Aureus
79
Hot Tub Folliculitis
pseudomonas aeruginosa | rash presents 1-2 days after being in hot tub
80
Psuedofolliculitis barbae
"Razor bumps" can occur over any shaved area related to curved hair follicles, foreign-body type reaction can be secondarily infected by staph aureus
81
What is a furuncle?
folliculitis that is deeper | tender, nodules/abscesses (boils)
82
What is a carbuncle?
deeper folliculitis where the infections are interconnecting under the skin several contiguous hair follicles
83
What is the treatment for Folliculitis?
Topical: - Mupirocin (Bactroban) - covers MRSA - Retapamulin (Altabax) ``` Oral: Keflex Augmentin (if you needed to bump it up) Bactrim DS (MRSA) Doxy (MRSA) Clinda (MRSA) ``` Cipro (psuedomonas - Hot tub)
84
What is the treatment for Folliculitis?
Topical: (if this is just one small location) - Mupirocin (Bactroban) - covers MRSA - Retapamulin (Altabax) ``` Oral: Keflex Augmentin (if you needed to bump it up) Bactrim DS (MRSA) Doxy (MRSA) Clinda (MRSA) ``` Cipro (psuedomonas - Hot tub)
85
Acute Paronychia
acute infection caused by Staph Aureus of the nail fold
86
Chronic Paronychia
loss of cuticle, proximal nail fold becomes boggy, nail plate becomes irregular/discolored
87
A pt comes in with a red swollen, painful hand with some red streaking. After asking some questions you find out he has a new kitten. What do you think he has? How do you treat it?
Cellulitis treat with Augmentin
88
A pt comes in with an itchy rash. After asking some questions you find out she was recently in a hot tub. What do you think she has and how would you treat?
folliculitis treat with cipro to cover for psudomonas
89
What is pediculus humanus capitis?
Head louse
90
What is pdiculus humanus corporiss?
Body louse
91
What is phihirus pubis?
Crab or pubic louse
92
What is pediculosis?
Lice
93
What is the primary symptom of pediculosis and what causes it?
Itching due to an allergic reaction to louse saliva
94
What do you need to dx lice?
Must have at least one life louse | Eggs (nits) does NOT confirm active infection unless they are "viable"
95
What is the treatment for head lice?
Since developing embryos may survive initial topical treatment you must repeat a second course 7-10 days laters to kill newly hatched nymphs ``` Permethrin (Nix) Pyrethrin Malathion Benzyl Alcohol Ivermectin (topical and oral) ``` Other treatments might include shaving or suffocation with mayo or vaseline Non-washable items should be sealed in plastic bags for 3-5 days
96
How do you treat crab lice?
Same as head lice
97
What diseases may be transmitted by body lice?
Typhus and trench fever
98
What is the treatment for body lice?
Wash entire body, topical treatment or oral ivermectin
99
What are the hallmark features of scabies?
Intense pruritic, papular rash with excoriations Borrowing typical in hands and wrists Typically the head and neck are spared
100
“Norwegian Scabies”
Crusted scabies EXTREMELY contagious (primarily in older, immunocompromised, or homeless)
101
What is the treatment for scabies?
Permethrin Lindane (risk of neurotoxicity) Crotamiton Oral Ivermectin
102
Cimex lectulrius
Bed bugs
103
What is the treatment for bed bugs?
``` Bites typically resolve within one or two weeks Topical or oral steroids Antihistamines Eradication -heating/steaming extermination -laundering of linens -vacuuming of furniture ```
104
Red, white, and blue sign
Seen with brown recluse spider bites Red (peripheral erythema) White (blanching) Blue (violaceous center)
105
nits
pediculosis eggs just the presence of eggs does not confirm dx because the shells might be empty they must be viable
106
How do you tell the difference between head lice and dandruff?
dandruff should flake off while nits are attached to the shaft via protein
107
Where are you more likely to see head lice?
in the homeless hair shafts behind the ears and on the back of the neck
108
How to lice treatment drugs work?
toxic to the louse nervous system however this might not kill the nits so you will need to do a second treatment 7-10 days later
109
What is the first line treatment for head lice?
Nix (permethrin 1%) OTC apply to dry hair for 10 minutes and then wash hair and comb to remove nits and lice repeat in 7-10 days
110
A pt comes in with a pruritic papular rash that is more itchy at night, what should you be thinking?
Scabies
111
What is the key characteristic of scabies?
Burrowing | typically in the webbed part of the hands and toes
112
Where are scabies rashes more commonly located?
Belt line Buttocks Genitalia in between the fingers and toes
113
How do you instruct pts to treat their scabies?
Permethrin 5% cream that is applied from the neck down after pt has showered washed off after 14 hours and then reapplied again in 1 week
114
How does treatment change for Norwegian scabies?
you do both topical and oral
115
Loxosceles reclusa
brown recluse spider
116
How do you treat a brown recluse spider bite?
most bites can be treated with rest, ice, and elevation make sure tetanus is up to date pain meds most importantly make sure wound is kept clean
117
What is the age of onset for pityriasis rosea?
adolescence through adults | more common in spring and fall
118
What is pityriasis rosea?
``` often considered viral (but truly unknown) falls under the class of papulosqaumous ```
119
What is the prodrome phase of pityriasis rosea?
HA Malaise mild constitutional sxs
120
What is the most common location on the body for pityriasis rosea?
the Herald patch - the trunk | the exanthem that appears weeks later - trunk and proximal extremities
121
Herald Patch
``` that initial patch of pityriasis rosea single oval lesion 2-10cm in diameter pink, salmon-red to erythematous slightly raised, fine collarette scale ```
122
Exanthem
In addition to the already present Herald rash, this new rash appears days to months later (typically 2 weeks later) presents as a smaller lesion on the trunk/proximal extremities
123
"Christmas Tree" distribution of a rash
Pityriasis rosea exanthem rash that follow langer's lines (cleavage lines of the body)
124
What is reverse pityriasis rosea?
when the lesions are on the extremities, sparing the trunk
125
What is atypical pityriasis?
herald patch may be absent or sole lesion OR multiple herald patches OR lesions may be present on face, neck, palsm and soles or unilateral OR vesicular, pustual, or urticarial variants
126
What are some of the DDx for pityriasis rosea?
lichen planus erythema multiform secondary syphilis
127
How do you dx pityriasis rosea?
clinically | can use KOH prep or RPR to rule out fugal infection and syphilis
128
What is the treatment for pityriasis rosea?
symptomatic antihistamines, calamine lotion, steroids +/- UVB phototherapy the rash will last for about 4-10 weeks
129
What is the epidemiology of lichen planus?
acute or chronic more common in females ~1% of the population 30-60 years of age
130
What is the cause of lichen planus?
idiopathic however it can be associated with Hep C so screen pts with LP for HCV infection can also be seen with drug reactions such as BB, HCTZ, ACEI, NSAIDs, antimalarial
131
What are the 6 Ps of lichen planus?
``` Purple Pruritic Polygonal Planar Papules Plaques ```
132
Where is lichen planus commonly found on the body?
``` flexor surfaces of the wrists, shins, lumbar, feet genitalia mouth hair nails ```
133
Koebner's Phenomenon
new lesions of lichen planus (and psoriasis) at the sight of trauma
134
Besides the 6 Ps, what does lichen planus look like? (looking for a commonly used descriptive term)
wickham striae | white, lacy reticular pattern (especially oral lichen planus)
135
Pts with chronic oral lichen planus are at an increased risk for what?
SCC
136
What is the DDx for lichen planus?
``` drug induced psoriasis secondary syphilis pityriasis roasea lupus ```
137
What is the DDx for oral lichen planus?
candidiasis leukoplakia lupus secondary syphilis
138
What types of drugs can cause lichen planus?
``` gold salts BB antimalaria pills HCTZ Furosemide spironolactone ```
139
How is lichen planus dx?
clinical presentation + punch biopsy (punch typically done by dermatologist) in the meantime start them on steroids (since it doesn't look fungal)
140
What is the treatment for lichen planus?
topical steroids if early and localized - Clobetasol (Temovate) - Bethamethason - Deproprionate (Diprolene) intralesional injections of Tiamcinolone Acetonide (Kenalog) for resistant or hyperkeratotic lesions Oral steroids for generalized lesions -Prednisone for 4-6 weeks then taper for 4-6 weeks
141
What is the prognosis of lichen planus?
majority of cutaneous LP spontaneously remit within 1-2 years recurrences may occur
142
coin-shaped, disseminated, pruritic eczema lesions found on the extremities
nummular eczema
143
What is Tinea Corporis?
superficial fungal infection of the skin typically from Trichophyton, Microsporum, Epidermophyton T. RUBRUM MC
144
What are the risk factors for tinea corporis?
affects all ages warm-hot environments animals contaminated soil
145
T. Rubrum
MC cause of tinea corporis
146
Pruritic lesions typically begin as erythematous scaly plaques with central resolution that is annular in shape might scale or crust due to inflammation in advancing border
Tinea Corporis
147
Malassezia furfur
causes tinea versicolor
148
Well-demarcated macules/patches with fine scale hypo-and hyperpigemention variable MC on trunk
tinea versicolor
149
What does tinea versicolor look like on a KOH prep?
spaghetti and meatballs
150
What is the age group for acute guttate psoriasis?
children and adolescents
151
What is the rash distribution of acute guttate psoriasis?
mainly on the trunk some on the face and scalp usually spares palms and soles
152
What is associated with acute guttate psoriasis?
it is often precipitated by an acute strep infection
153
What does pityriasis mean?
scaling
154
Langer's Lines
Skin cleavage lines of the body that pityriasis rosea tends to follow (Christmas tree distribution)
155
What do you use KOH prep for?
to determine if a rash is fungal | used in pityriasis to rule out fungal (since this rash looks fungal)
156
How does pityriasis rosea typically present?
Might have a prodrome of HA and malaise Herald Patch is the first and largest patch about 2 weeks later they might have a full blown rash
157
at what point with pityriasis rosea would you get a skin biopsy?
if 3 months has passed and no improvement (maybe misdx)
158
What is the RPR test used for?
tests for syphilis this is a do not miss dx know when its on the ddx -pityriasis rosea
159
If a pt comes in with lichen planus, what should you screen them for?
Hep C | there is an association between these 2
160
If a pt has had a recent trauma and then presents with this papule like rash, what should you be thinking?
Lichen planus | Koebner's Phenomenon
161
What age group is most common with erythema multiforme?
can occur in all ages but peaks between 20-40 years of age | M > F
162
What is the MC etiology of erythema multiforme?
HSV
163
What drugs can cause erythema multiforme?
barbiturates, NSAIDs, PCNs, metformin, cipro, bupropion even vaccines (diptheria -tetanus, hep B)
164
What is the prodrome for erythema multiforme?
Fever malaise myalgia sore throat and cough if d/t mycoplasma
165
What is the typical presentation of erythema mutliforme?
might have a prodrome starts benign acutely and evolve over days have a dark center --> target lesion (round with 3 concentric zones) typically starts distal and moves proximal loves palms and soles (think about secondary syphilis and lichen planus) loves elbows and knees (so does psoriasis)
166
What is the difference between erythema mutliforme major and minor?
Major is more commonly d/t drug erruption (think about steven johnson syndrome) major always has mucus membrane involvement minor usually confined to extremities and face with classic target lesions with little to no mucous membrane involvement, usually associated with HSV outbreak
167
What is Nikolysky sign?
seen with major erythema multiforme when you rub the skin it comes off this is why you are worried about stevens-johnsons syndrome
168
What is the prognosis of erythema multiforme?
usually resolves spontaneously within 3-5 weeks | may be recurrent (especially for those with recurrent HSV)
169
What is the treatment for erythema multiforme?
remove any offending drug oral antihistamines and topical steroids for symptomatic relief oral prednisone for severe cases treat underlying etiology - HSV: acyclovir - Mycoplasma: macrolide
170
Where does secondary syphilis most commonly present on the body?
mucosal lesions | palms and soles
171
What is atopy?
eczema, hay fever, asthma sometimes we add ASA allergy typically in the family hx
172
What is the cause of pityriasis (tinea) versicolor?
yeast infection | overgrowth of the yeast on the body
173
What is the prevention for herpes zoster?
vaccine for those >60 years (~60% reduction)
174
What is the treatment for herpres zoster?
acyclovir within 72 hours of rash onset | 5x/day for 7-10 days
175
Molluscum contagiosum
viral rash caused by a pox virus mostly in children or young adults it's self limited for about 2 months
176
Verruca Vulgaris (HPV)
``` common wart (from HPV, just a different strand) occurs weeks to months after skin to skin exposure ```
177
condylomata acuminata
anogenital warts
178
What is the treatment for HPV?
no treatment is curative surgery is the most likely to be curative (and cheapest option) QUIT SMOKING
179
How do you prevent HPV?
``` Gardasil vaccine protects against 9 different types -6 and 11 -16,18,31,33,45,52, and 58 ideally administered before the individual has become sexually active ```
180
umbilicated papules discrete, solid, skin-colored papules 3-5mm describes what kind of skin problem?
Molluscum contagiosum
181
What is the treatment of verruca vulgaris?
chemically or physically burn it off or just wait because they are self limiting educate the pt not to spread it around (contagious)
182
What is respiratory papillamatosis?
caused by vaginal birth when someone has HPV | the infant inhaled the virus
183
How do you dx HPV?
warts if its type 6 or 11 dysplasia of epithelial cells on pap smear (type 16 and 18) application of acetic acid solution (vinegar) --> colposcopy (not sure how common this is)
184
When do you see post-adolescent acne?
83% of women have pre-menstrual flares
185
What is oral isotretinoin used to treat?
aka accutane used for severe acne (6 months of treatment) works by shrinking sebaceious glands and decrease sebum secretions
186
What topical agents can be prescribed for acne?
retinoids such as tretinoin, adapalene, tazoratene
187
What is the most mild form of acne?
comedonal acne
188
What is the worst form of acne?
nodulocystic
189
What is the treatment for pts with acne around their periods?
OCPs spironolactone (decrease sebum production)
190
What are the side effects of accutane?
be sure this is monotherapy (no other acne meds) - dry skin and lips - photosensitivity - teratogenicity (iPLEDGE) --> must have monthly pregnancy tests - hypertriglyceridemia - hepatotoxicity - myalgia - Pysch effects
191
What is rosacea?
facial flushing inflammatory papulopustual eruption unknown cause chronic and relapsing
192
What is the classic form of rosacea?
papulopustual erythematotalangiesctatic is central facial flushing (not classic)
193
What is phymatous?
Rosecea | thickened and irregular surface of nose, chine, forehead, ears, eyelids
194
What treatements for rosecea help with the redness?
topical brimonidine and oxymetazoline
195
What is hidradenitis suppurativa?
follicular occlusive disease found in the skin folds
196
What is the epidemiology of hidradenitis supporativa?
rare 1-4% onset: puberty - 40y/o W > M
197
What is the pathogenesis of hidradenitis suppurativa?
hormones increase follicular epithelial hyperplasia that leads to nodule that can turn into an abscess this can lead to comedones or scarring
198
What is stage 1 of hidradenitis suppurativa?
abscess formation without sinus tracts or scarring
199
What is stage 2 of hidradenitis suppurativa?
recurrent abscesses with sinus tracts, scarring
200
What is stage 3 of hidradenitis suppurativa?
diffuse involvement, multiple interconnected sinus tracts and abscesses
201
What is the treatment of hidradenitis suppurativa?
``` No cure Lifestyle modification: -avoid skin trauma (wear loose clothing) -daily gentle cleansing -smoking cessation -no dairy ``` Mild: - topical treatment - CLINDA - punch debridement - intralesional corticosteroid injections - 7-10 day course of PO ABX (doxy) Moderate: - PO ABX up to 3 months - spironolactone - punch debridment Severe: - prednisone - humera - PO isotretinoin
202
Anagen
growth phase of hair cycle 2-6 years 80-90% of hairs on normal scalp
203
Catagen
involutional phase of hair cycle 2-3 weeks 5-10% of hairs on normal scalp
204
Telogen
resting phase of hair cycle 2-3 months 1-3% of hairs on normal scalp
205
How many hairs is normal to loose a day?
100
206
Alopecia Areata
Chronic immune mediated disorders target anagen hair follicles non-scarring hair loss very smooth round patch of skin
207
What is the age group for alopecia areata?
usually before the age of 30 | M = F
208
alopecia totalis
complete loss of scalp hair
209
alopecia universalis
loss of scalp and body hair
210
What is the treatment for alopecia areata?
intralesional corticosteriods (triamcinolone) injected into upper subQ of scalp potent topical steroids topical immunotherapy
211
What is telogen effluvium?
diffuse non-scarring alopecia sometimes bitemporal hair loss <50% hair loss, no balding occurs
212
What are the typical causes of telogen effluvium?
``` major surgery serious illness childbirth protein or caloric malnutrition thyroid disorders drugs emotional stress ```
213
What is the pathogenesis of telogen effluvium?
``` # of hairs in telogen phase increases unknown why ```
214
What is the treatment for telogen effluvium?
removal or treatment of underlying cause minoxidil is controversial usually is self-limited in 6-12 months
215
What is androgenetic alopecia?
typically in men | progressive loss of terminal hairs on anterior scalp, mid-scalp, temporal scalp
216
Malassezia
yeast that causes tinea versicolor
217
What is pityriasis alba?
small white scaly "patches" typically on the faces of kids after summer
218
Tinea capitis
infection of scalp hair typically seen in children caused by direct contact with an infected individual pruritic
219
What is tinea corporis?
pruritic circular or oval, erythematous scaling plaque that usually has a central clearing and a raised border
220
What is tinea cruris?
fungal infection of the groin
221
What is tinea pedis?
fungal infection of the foot | "athletes foot"
222
What is tinea unguium?
Fungal infection of the nail | "onychomycosis"
223
What is the treatment for tinea capitis?
oral antifungals | griseofulvin for 6-12 weeks
224
What is the treatment for tinea cruris?
topical antifungals terbinafine PO Itraconazole PO
225
What pathogen causes impetigo?
staph and strep
226
What is considered "classic impetigo?"
nonbullous impetigo erythematous macules/papules that evolve into vesicles that rupture --> honey-colored crust
227
Where is classic impetigo more commonly located on the body?
face and extremities
228
Bulla
vesicle greater than 1 cm
229
Why might you prescribe clinamycin for impetgio and what are the possible side effects?
if you think the impetgio is MRSA SE: C. Diff (so be cautious in older pts)
230
What is the likelihood that someone who is allergic to PCN will be allergic to cephalopsorins?
since PCNs and cephs are cousins there is a 10% chance that someone allergic to PCN will be allergic to cephs
231
What do you do if a pt has recurrent infections of impetigo?
do a nasal swab (MRSA likes to hang out in the nares) treat with bactroban intransal
232
What is a potential complication of impetigo?
poststrep glomerulonephritis
233
What pathogen is most commonly responsible for erysipelas?
GAS - group A strep
234
"I went to bed last night fine and woke up this morning with the huge rash on face"
typical presentation of erysipelas | very acute painful onset
235
How can you tell the difference between erysipelas and cellulitis?
Erysipelas has very clear borders acute onset typically on the face Cellulitis does not have clear borders and is less of an acute onset can be anywhere on the body but lower extremities are more common in some cases it will be hard to tell the difference between these two but you are going to treat it more broadly so you cover both
236
Where is erysipelas more commonly located on the body?
cheeks and ears
237
Why would you get imaging (Xray, MRI, CT) on a pt you suspect has cellulitis?
- to rule out osteomyelitis | - if pt has periorobital cellulitis you want to see if they have proptosis and aggressively treat right away
238
You're in the ER with a pt who you suspect has cellulitis of the lower right calf. What will your discharge notes report?
first mark their leg with a skin marker around the rash so you can compare at a later date to see if it has improved 1) take kephlex (cephalexin) 2) elevate the leg 3) use Tylenol and warm compresses PRN 4) return in 2 days for wound check or set up a phone appointment to make sure the rash has improved inform the pt that at first the rash might get worse due to the bacteria dying a releasing more toxins but that shortly after that it should improve if the follow up will not be with you consider printing out their chart for the pt to give the next MD they see
239
What pathogen should you be thinking about with ciprofolxacin?
psuedomonas
240
What is the treatment for acute paronychia?
warm soaks I and D ABX make sure their tetanus is up to date
241
What is the treatment for chronic paronychia?
encourage good nail hygiene stop nail bitting no ABX
242
Terms to describe the common wart?
Papillomatosis (microscopic term) verruca vulgaris (HPV)
243
What is telangiectasia?
spider veins | sometimes seen with BCC
244
How do you differentiate rosacea from acne?
rosacea doesn't have comedones and is more redness localized to the central part of the face (not usually on chest or back)
245
When should you be concerned about hyperandrogenism?
it can be normal for women to get acnea around their periods, however if you see these other signs you should be concern (you want to rule out PCOS): - hair loss - irregular menses - infertility - abrupt onset of severe acne - cushingoid features - acne refractory to therapy - acanthosis nigricans - obesity
246
Which treatments are used to attack the follicular hyperkeratiniazation part of acne?
topical retinoids and isotretinoin azelaic acid salicylic acid
247
Which treatments are used to treat the increased sebum production part of acne?
``` oral isotretinoin hormone therapies (OCP, spironolactone) ```
248
Which treatments are used to treat the P. Acnes proliferation part of acne?
Benzoyl Peroxide (BPO) Topical antimicrobials Oral ABX: doxy or minocycline (limited to 3 months) Azelaic acid
249
Which treatments are used to treat the inflammation part of acne?
oral isotretinoin oral ABX Topical retinoids azelaic acid
250
Hydroquinone plays what role in acne treatment?
post-inflammatory hyperpigmentation | helps lighten dark spots
251
What treatments help with the rosacea bumps?
``` topical metronidazole topical azelaic acid sulfacetamide topical acne meds retinoids ABX (targeting inflammation more than bacteria) ```
252
How can you tell rosacea from lupus?
both can be on the face | lupus is more purple and has more demarcated borders
253
Alopecia universalis
a type of alopecia areata where there is loss of scalp and body hair including the eyelashes
254
What is the best treatment for onychomycosis?
Oral antifungals since topical antifungals take almost a year to work
255
Lichen Planus genital lesions are most commonly seen where?
glans penis vulva/vagina remember this may be associated with SCC --> long term follow up
256
Lichen Planus hair lesions if left untreated...
can result in scarring alopecia
257
Which lesions of lichen planus represent a more advanced lesion?
esophageal lesions
258
A pt comes in with oral lesions and body lesions, what should you be thinking?
lichen planus | but also lupus!
259
What do you see on microscope with lichen planus?
hyperkeratosis | both para and ortho
260
What is Nikolsky sign and when might it be positive?
its when you take a pencil eraser to the pts rash and gently twirl it back and forth. if a blister appears within minutes its a positive sign seen often with Erythema multiforme major (typically d/t drug eruption)
261
Where is erythema multiforme commonly seen on the body?
the distal extremities moving proximally and the face
262
Risk factors of tinea corporis?
ringworm basically warm-hot environments animals contaminated soil
263
Who is more likely to get mooluscum contagiosum?
children, sexually active adults, pts with HIV
264
What lesion is caused by pox virus?
molluscum contagiosum
265
How would you describe a molluscum contagiousm lesion?
discrete, solid, skin-colored papule 3-5mm on the chest red halo regressing spontaneously UMBILICATED papules
266
Condylomata acuminata
angogenital warts
267
How do you dx HPV?
acetic acid solution application with whitening of the lesions
268
Phthirus pubis
crab or pubic louse
269
Pediculus humans corprois
body lice
270
Which type of pediculosis run the risk of causing a systemic disease?
body lice typhus and trench fever d/t louse feces (note even scabies runs this risk)
271
By the time a pt is scratching due to head lice, how long have they had the infestation?
it takes 2-6 weeks to develop a reaction the more times (# of times) you are exposed the shorter time it takes to mount a response
272
Where are you likely to see nits are what do they look like?
close to the scalp on the shaft of the hair (they need the warmth of the head so they are close to the scalp) --they hold on using a protein matrix and do not easily flake off like dandruff would brown colored indicates an active nit
273
Permethrin is used for what?
OTC treatment for head lice
274
How do you treat pediculus humansus capitus for a pregnant pt?
benzyl EtOH 5% apply to dry hair for 10 minutes --wash hair -- comb hair to remove nits and lice repeat in 7-10 days
275
How does mayonnaise, olive oil, and vaseline work for head lice?
considered suffocating but what's really happening is that you are slowing them down enough to allow you to effectively comb them out
276
What must you keep in mind for anyone with crab lice?
that this is considered an STI and you should screen them for STIs
277
Ivermectin is used for what?
PO treatment for body lice and scabies
278
Why is dx body lice sometimes difficult?
body lice are only on the body when they are feeding | so be sure to check clothing for fece marks
279
How long can scabies survive off the body?
4 days
280
How do you treat Norwegian scabies?
topical + oral drugs | such as permethrin and ivermectin
281
Cimex lecturlrius
common bed bug
282
General characteristcs of drug induced rashes
symmetrically start on the trunk and move distally
283
Immediate reactions (drug-induced)
``` Occur less than 1 hr of the last administered dose Type 1 hypersensitivity Uritcaria Angioedema Anaphylaxis ```
284
Delayed reaction (drug-induced)
Occurring after 1 hour, but usually more than 6 hours and occasionally weeks to months after the start of administration Exanthematous eruptions Fixed drug eruption Systemic reactions (DIHS, SJS, TEN)
285
Which drug do we do allergy drug testing for?
PCN
286
What is the most important information in determining if a rash is medication-related?
TIMING
287
For exantheamtous drug eruptions, initiation of the medication is often ____days before the rash
7-10 days
288
What are risk factors for drug reactions?
``` Females Prior history of drug reaction Recurrent drug exposure HLA type Certain disease states (EBV, HIV) ```
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Exanthematous Drug Eruption
Most common of all cutaneous drug eruptions Does not blister Macularpapular Pruritic +/- fever Rash appears more than 2 days after drug has been started (commonly around day 8-11) will persist 2-3 days after stopping the drug
290
Where are the greatest areas of steroid absorption on the body?
thin areas eyelids, genitals, skin creases use lower potency in these areas
291
Where are the least areas of steroid absorption on the body?
palms and soles | require higher potency drugs
292
What are the characteristics and benefits of ointments?
best for dry, thickened areas due to being oil based and helps trap in the water (moisturizer) best for dry, non-hairy skin avoid thin areas (face, armpits)
293
What are the characteristics and benefits of creams?
water based with oil less potent than ointments easy to wash off more cosmetically appealing have preservatives (might cause side effects) used for exudative types lesions and intertriginous areas
294
What are the characteristics and benefits of gels?
``` alcohol base with water and oil has drying effect greaseless, transparent may be used on hair-bearing area will caused stinging to inflamed skin ```
295
What are the characteristics and benefits of lotions?
powder in water (have pt shake the bottle) least potent of topical steroids good for large body areas (including hairy areas) provide cooling, drying effect as they evaporate
296
What are the 7 groups of topical steroid potency?
``` super potent (Group 1) high (2 and 3) medium (group 4) lower - mid (group 5) low (group 6) least potent (group 7) ```
297
What conditions are treated with high potency steroids (group 1-2)?
``` alopecia areata atopic dermatitis (only if resistant) discoid lupus lichen planus nummular eczema (only if resistant) hyperkeratotic eczema psoriasis ```
298
What conditions are treated with medium potency steroids (group 3-5)?
anal inflammation atopic dermatitis nummular eczema seborrheic dermatitis
299
What conditions are treated with low potency steroids (group 6-7)?
diaper dermatitis | eyelid and facial dermatitis
300
What is the most common side effect of topical steroids?
skin atrophy other side effects: - striae - easy bruising or tearing of the skin - telangiectasias - hypopigmentation - acneiform eruption, steroid - induced rosacea - cushing syndrome or hyperglycemia - glaucoma or cataracts - tachyphylaxis
301
Path of atopic dermatitis
genetic defect that disrupts skin barrier function making the skin more sensitive to irritants
302
What is the epidemiology of atopic dermatitis?
very common 11-19% all cases start within first decade of life only 5% of cases develop after 5 years of age this is an infant/toddler disease
303
How does the rash distribution of atopic dermatitis differ between age?
children: face older: flexor surfaces
304
What is a long term treatment to decrease skin infections d/t atopic dermatitis?
bleach baths
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Exanthematous Drug Eruption
Most common of all cutaneous drug eruptions Does not blister Macularpapular Pruritic +/- fever Rash appears more than 2 days after drug has been started (commonly around day 8-11) will persist 2-3 days after stopping the drug
306
Fixed Drug Eruption
Solitary erythematous patch or plaque that will recur at the same site with re-exposure to the drug
307
What drugs are associated with fixed drug reaction?
``` Phenophthalein (laxatives) Tetracyclines Sulfa drugs NSAIDs Barbiturates Food coloring (yellow) ```
308
Where are the common locations for fixed drug reaction rashes?
Mouth Genitalia Face Acral areas Remember this is one solitary lesion
309
What is the time of onset for fixed drug reactions?
30 minutes to 8 hours after ingesting the drug (for previously sensitized individuals)
310
What is the treatment of fixed drug reactions?
Lesions resolve days to weeks after the drug is discontinued Non-eroded lesions can be treated with an antimicrobial ointment and a dressing until the site is reepithelized Address pain
311
Drug-induced hypersensitivity syndrome
Also known as drug reaction with eosinophilia and systemic symptoms (DRESS) Skin eruption with systemic sxs and internal organ involvement (liver, kidney, heart) Typical sxs: macular exanthema, erythematous centrofacial swelling, fever, malaise, lymphadenopathy, involvement of other organs >70% of pts have an eosinophilia
312
When are you going to stop all medications for a pt with a skin rash?
If you suspect DIHS and they’re basically on their way to the ICU
313
What is the treatment for DIHS?
Get Dermatology involved Stop medications if severe Start systemic steroids if severe (topical + antihistamines if moderate)
314
What medications can cause DIHS?
``` Allopurinol ABX (sulfas, PCNs) NSAIDs AntiTB drugs Anticonvulsants AntiHIV drugs ```
315
What is the clinical course of DIHS?
typically starts 3 weeks post drug ``` macular exanthem erythematous centrofacial swelling fever, malaise lymphadenopathy >70% have eosinophilia ```
316
Epidermal Necrolysis Spectrum
A spectrum that includes SJS and TEN
317
What is the mortality rate of SJS/TEN?
SJS 5-12% | TEN >20%
318
Which drugs have higher risk of SJS/TEN?
``` Sulfa ABX Allopurinol Tetracyclines Anticonvulsants NSAIDs Nevirapine Thiacetazone ``` (Mnemonic SATAN)
319
What is the time frame of SJS/TEN?
Clinically begins within 8 weeks after onset of drug exposure
320
What clinical findings do you see with SJS/TEN?
Fever HA Rhinitis Myalgias May precede the mucocuutaneous lesions by 1-3 days Eruption is initially symmetric and distributed on the face, upper trunk, and proximal extremities Rash can rapidly extend to the rest of the body Erythematous, irregularly shaped, dusky red to purpuric macules (atypical targets) which coalesce NIKOLSKY sign
321
How do you determine the difference between SJS and TEN?
Based on the TBSA which is determined by counting ALL skin lesions, ruptured and unruptured blisters
322
For a pt you suspect has SJS/TENs which consults will you be contacting?
Derm Ophthamology Gynecology
323
SSSS
Staph Scalded Skin Syndrome Infant disease most commonly Staph bacteremia
324
Bright red confluent painful rash with large blisters. Sandpaper texture.
SSSS
325
What is the path behind SSSS?
Staph exfoliative exotoxin cleaves the desmoglein 1 complex 5% of all Staph Auerus strains produce this endotoxin Spread person - person
326
What is the mortality rate of SSSS?
Infants 4% | Older children/adults 60%
327
What is the prodrome for SSSS?
Fever Sorethroat Conjunctiviits
328
What is the time frame for SSSS?
Rash develops within 48 hours of prodrome
329
How do you differentiate SJS/TEN from SSSS?
Biopsy SSSS - epidermal cleavage SJS/TENS - subepidermal cleavage w/ epidermal necrosis
330
What is the treatment for SSSS?
Penicillinase-resistant PCN - Nafcillin, oxacilin - Vanco for MRSA Wound care Monitor fluid status
331
Pemphigus
Bullous disease Autoimmune disease Painful, generalized flaccid blisters with mucosal involvement Acute and chronic forms Can be confused with SJS 4 types: - Pemphigus vulgaris (70%) - pemphigus foliaceus - IgA pemphigus - Paraneoplastic pemphigus
332
What is the path behind pemphigus vulgaris?
Acanthloysis (loss of adhesion from keratinocyte to keratinocyte) results d/t circulating autoantibodies (IgG) against epithelial cell surface antigens (desmoglein 1 and 2) leading to intra epithelial cutaneous and mucosal lesions
333
What is the epi for pemphigus vulgaris?
Rare (0.1 per 100,000) Higher risk in Ashkenazi jews, indian, mediterranean, middle east decent Age 40-60 years M = F Genetics
334
Contributing factors of pemphigus?
Genetic -HLA class 2 Drugs - penicllamine, captopril, NSAIDs, cephs Infections - Herpes, coxsackivirus
335
Clinical picture of pemphigus vulgaris
usually starts with painful excoriated mouth blisters can be months before cutaneous signs flaccid irregular border and varying size blisters begin to form on normal appearing tissue blisters usually coalesce and rupture easily PAINFUL
336
How do you dx pemphigus vulgaris?
Skin biopsy - intraepithelial seperation and acanthloysis | “Tombstone” appearance d/t retention of keratinocytes
337
What is the treatment for Pemphigus vulgaris?
Corticosteroids Immunosuppressive drugs -rituximab, sulfasalazine, methotrexate IVIG
338
What is the difference between bullous pemphigoid?
Both are autoimmune Bullous pemphigoid is sub-epidermal blister while PV is intra-epidermal blistering Bullous is less deadly and rarely involves mucous and higher age of onset (65-70) Both are prone to relapse
339
What is necrotizing fasciitis?
Invasive bacterial infection of the soft tissue and deep tissue invading the fat, fascia, and at times underlying muscle causing death of tissues Bacteria spread occurs across fascial plane
340
What are risk factors for necrotizing fasciitis?
``` DM immune compromised (CA, organ transplants) Obesity Surgery Traumatic wounds ```
341
Necrotizing Fasciitis type 1
Polymicrobial Anaerobes: one of (bacteroides, clostridium, peptostreptococcus) PLUS Facultative anaerobes (e. Coli, entrobacter, klebsiella, proteus)
342
Necrotizing Fasciitis type 2
``` Monomicrobial GAS Staph MRSA Vibro vulnificus ```
343
What is the presentation of necrotizing fasciitis?
Fever Intense pain (early on its out of proportion to PE findings) Systemic toxicity +/- site of introduction Local edema, cerpitus Skin abnormality, red, purple, or necrotic tissue SPREADS RAPIDLY
344
What is the treatment for necrotizing fasciitis?
ABX - carbapenems - anaerobic coverage - clindmycin - MRSA coverage (Vanco, linezolid) NPO because they are going to the OR TODAY
345
Fournier Gangrene
Necrotizing fasciitis of the perineum or scrotum
346
What pathogens are responsible for fournier gangrene?
E. Coli (aerobe) | Bacteroides (anaerobe)
347
What is the Epi of fournier gangrene?
80% have DM Trauma to genitalia frequently associated M > F Age: 30-60 years
348
What is the path of fournier gangrene?
Effects superficial and deep tissues of genitalia and perineum Infection can originate from anorectum, urogenitalia tract, or skin of the genitalia Can spread across the Colles fascia of the abdominal wall and Scarpa’s fascia of the inguinal area
349
What is the treatment of fournier gangrene?
Fluid support ABX (cover gram -, +, anaerobes, MRSA) REMOVE DEAD TISSUE ASAP +/- IVIG
350
What are complications of Fournier Gangrene?
``` Pain with erection (50%) Genitial scarring Impotence Psych consideration Extensive reconstruction needs NSQIP mortality rate: 10% ```
351
Purpura fulminans
Thrombotic disorder with purple hue enlarging lesions and necrotic distal digits caused by hemorrhagic skin necrosis and coagulation impairment rapidly leading to DIC Idiopathic vs underlying infectious caused (meningococcal meningitis - Neisseria)
352
Protein C deficiency is associated with which type of skin disorder?
Pupura fulminans
353
Which infection is most commonly associated with purpura fulminans?
Neisseria meningococcal meningitis
354
What is the presentation of purpura fulminans?
7-10 day onset after infection Starts DISTALLY symmetric Systemically ill - fever, hypotension
355
What is the treatment for purpura fulminans?
``` Fluid management ABX broad spectrum DIC management Heparin vs protein C concentrate Remove dead tissue —typically amputation ```
356
For a pt with atopy, which part of the triad typically started first?
Atopic dermatitis when they were an infant
357
What is the most common treatment for atopic dermatitis?
Emollients (thicker form of lotion OTC)
358
What is the epi of atopic dermatitis?
Common. 11-19% prevalence All cases start within the first decade of life Only 5% of cases develop after 5 years of age
359
What is the lesion distribution by age for atopic dermatitis?
Infants: face Older: flexor surfaces
360
What other skin condition might present with a pt who has atopic dermatitis and why?
Impetigo due to these pts having more staph on their skin
361
What are the characteristics of the rash for chronic atopic dermatitis?
Lichenification (leather like fibrosis d/t chronic scratching) Hyperpigmentation (if active) Depigmentation (overtime)
362
On your differential for atopic dermatitis is contact dermatitis. How can you tell these two apart?
Contact dermatitis (whether allergic or irritant) is always related to the location in which the pt was exposed
363
How can you tell scabies apart for atopic dermatitis?
Atopic dermatitis in infants is always on the face while scabies typically is seen on the trunk (belt line) and genitalia
364
How can you tell atopic dermatitis from seborrheic dermatitis?
Seborrheic dermatitis is commonly found in the nasolabial folds but has more flaking as opposed to the pustule appearance of atopic dermatitis
365
What is first line treatment for atopic dermatitis?
Ideally using emollients often enough to decrease flare ups and thus the need for steroids STEROIDs are first line treatment for flare-ups —mid potency (grade 5-7) apply 2-3 times a day Second line - TCIs (Topical Calcineurin Inhibitors)
366
Rank in order from most potent to least potent vehicles of steroids
Ointment > cream > lotion
367
What are the major side effects of long term use of high dose steroids?
Skin atrophy!! Telangiectasia Striae
368
What is an appropriate long term treatment/prevention for atopic dermatitis?
Bleach baths
369
What determines potency of a topical steroid?
Vasoconstricitve effect Grade 1 = most potent Grade 7 = least potent
370
Super high potency topical steroids (group 1) are best for use where?
Palms and sole, hyperkeratotic lesions Short term use - no longer than 3 weeks
371
How do you determine how much steroid to prescribe a pt?
You will be doing once or twice dosing daily FTU - fingertip unit application method 1 fingertip unit = 0.5 grams Multiply that by how many FTUs are needed to treat specific area (numbers given on a chart) This will tell you how much is needed for 1 application For ex. 0.5g x 7 FTUs needed for trunk = 3.5 gms needed per application 2 applications a day for 1 week = 49g tube needed
372
Which steroids can be used for intralesional injections and for which conditions is this done?
Triamicinolone acetonide Methylprednisone acetate Hyperkeratotic lesions Cystic acne Keloids
373
Immediate reactions to drugs
Occur less than 1 hour after last administered dose Type 1 hypersensitivity reaction Urticaria Angioedema Anaphylaxis
374
Delayed reactions to drugs
Occurring after 1 hour but usually more than 6 hours and occasionally weeks to months after the start - exanthematous eruptions - fixed drug eruption - systemic reactions (DIHS, SJS, TEN)
375
What is angioedema?
Leaky blood vessels in the lower dermal layer caused by histamine release
376
Erythematous patch with central bulla
Fixed drug eruption
377
What is the path of psoriasis?
Autoimmune Multifactorial (genes + environment) HLA-Cw*0602 Bad MHC-1 receptor that the body sees as foreign and attacks This results in hyperkeratosis
378
What do you see microscopically with psoriasis?
Acanthosis - “Test tubes in a row” Hyperkaratosis with parakaratosis
379
Who gets psoriasis?
2-3% W > M (or is it that women are more likely to seek help?) Onset 15 - 30 y/o (median age 28) 10-15% begin in children young than 10
380
Erythematous scaly patches, plaques. Might be painful. Well defined round or oval plaques. Symmetrically found on the extensor surfaces of arms, legs, scalp, buttocks, and trunk.
Psoriasis 90% are plaque Silvery scale unique to psoriasis
381
What is the most common ocular finding in psoriasis?
Blepharitis Plaques forming at the glands that lead to the eye Eyelid erythema, edema, and psoriatic plaques
382
What nail findings might you see with a psoriatic pt?
Onychodystrophy Pitting Fingernails > toenails Does not respond well to tx
383
What is the time frame of psoriatic arthritis?
~12 years after onset of skin disease This puts the onset to about 30-40 years of age This is not typical for arthritis so it helps you narrow you ddx to psoriatic arthritis If you treat it early you help prevent it from progressing to full blown arthritis
384
How do you dx psoriasis?
Clinical dx Unless its not the typical plaque psoriasis Ddx - syphilis - pityriasis rosea - pityriasis alba - tine - atopic dermatitis
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What defines the difference between mild and severe psoriasis?
Mild: <5% of BSA Severe: >5% of BSA
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What are recommendations to help manage psoriasis for all forms and severity?
``` Daily sun exposure Topical moisturizers Sea bathing (order salt for salt baths at home) Relaxation Salicylic acid lotions OTC “tar” preparations ```
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What is the treatment for mild psoriasis?
Topical steroids Vitamin D analogs (calcipotriol, calcitriol) Tazarotene (Tazorac) Calcineurin inhibitors (tacrolimus, pimecrolimus) Always consider PSYCH help for those that struggle with the social part or have genital plaques
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What is the treatment for severe psoriasis?
Severe (>5%) Mainstay of treatment = systemic therapy +/- phototherapy -methotrexate (immunosuppressant) SE: bone marrow suppression -Acitretin (retinoid) - particularly good for pustular or palmoplantar forms SE: teratogen -Cyclosporine (calcineurin inhibitor) - used for rapid relief, “crisis therapy” -Apremilast (PDE4 inhibitor) —good for arthritis
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Cyclosporine is used for what?
Rapid relief, bridge therapy or “Crisis” therapy for severe psoriasis SE: GI intolerance, renal impairment
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What other options do you have if a pt with severe psoriasis isn’t responding to topical + systemic meds?
Biologics - all injections TNF-a inhibitor (Humira - Adalimumab - SC injections q2 weeks) IL-12/IL-23 inhibitors IL - 17 Inhibitors On these injections for LIFE $$$$$ Insurance will only cover it if you have exhausted every other option of psoriasis treatment
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Fitzpatrick Skin type 6
Black | Never burns, tans very easily
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Fitzpatrick skin type 1
White; very fair; red or blonde hair; blue eyes; freckles Always burns, never tans
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What is the path of vitiligo?
Multifactorial disorder Immune-mediated melanocyte destruction Absence of melancytes within lesions Must have some type of exposure before the disease starts (not sure what that exposure is but this isn’t seen at birth) Associated with other autoimmune disorder
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Who gets vitiligo?
``` It’s the most common depigmentation disorder 1% of general population Family hx in 25 - 30% of pts Adults = children F = M ``` Age of onset typically ~10 years Pts commonly have DM
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What are precipitating factors of vitiligo?
Usually nothing but sometimes: Illness Emotional stress Sunburn
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How do you dx vitiligo?
Clinically | Might need woods lamp in fair skinned individuals —the lesions will illuminate
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What is the typical distribution of vitiligo?
``` Neck, clavicle Arm pits Genitalia Fingertips Knees Feet ``` Might also see it at sites of “trauma” - Koebner’s Phenomenon
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What is the treatment for vitiligo?
Sun protection - SPF 50 min —need to protect from SCC, BCC Cosmetic coverage Topical steroids - Betamethasone (0.05%) - for actively growing lesions Phototherapy - to kill off the expansion Depigmentation Surgical grafting (not a good option)
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Oculocutaneous albinism
Skin, hair, and eyes without melanin production
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What is the inheritance pattern of albinism?
Autosomal recessive
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What is the path of albinism?
Autosomal recessive Mutation of tyrosinase - enzyme used in melanin production Results in no melanin production
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What is the treatment of albinism?
Prevention of sun damage SPF 50 UVR blocking clothes Regular follow up with dermatology and ophthamology
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Solar lentigines
“Liver spots” Localized proliferation of melanoctyes and melanization Hperpigmented, well-circumscribed lesions Sun exposed areas Skin Types 1-3 most at risk
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What do you have to keep in mind when dx solar lentigines?
Must differentiate from actinic kertosis and lentigo maligna - premalignant condition - warning signs: rapid growth, pain, itching, bleeding, poor healing Can be difficult to distinguish from early seborrheic keratosis Solar lentigines will just show up over a few days and will stop growing ...no pigmentation change, no growth, no elevation If it does change be weary that this is no liver spots
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What is the treatment/prevention of solar lentigines?
Basically just make sure this isn’t precancerous Albative therapies - chemical peels, cryotherpay, laster therapy Topical theapies - hydroquinone, retinoids Prevention: regular sunscreen use and limiting sun exposure
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Melasma
Progressive, macular, nonscaling hypermelanosis of sun-exposed areas (face) Associated with: - pregnancy - oral contraceptive use - phenytoin Skin types 4-6
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What is the treatment of melasma?
Hydroquinone 3% or 4% Glycolic or Azelaic acid peel Retinoids Prevention: - sunscreen - discontinue oral contraceptive
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Freckles
Ephelides Small 1-2mm sharply defined macular lesions, uniform color Face, neck, chest, arms Childhood onset Fade in winter Can be treated in same manner as lentigo if necessary
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Cafe-au-Lait macules
``` Tan or brown macule 1-20 cm (HUGE) Present at birth or early childhood 10-30% of general population has isolated cafe-au-lait Increase in melanin production Usually found on trunk ``` ``` IF >6 CAFE-AU-LAIT LESIONS: Think about other underlying conditions (This can be a precursor) -fanconi anemia -neurofibromatosis -tuberous sclerosis -albright syndrome ```
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Acanthosis Nigricans
Seen in DM or obese pts Dark, hyperkeratosis streaks in skin folds: - neck - axilla - groin - body folds
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What is the treatment of acanthosis nigricans?
Treat the underlying condition | DM or weight loss
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Post-inflammatory hyperpigmentation
Irregular, dark pigmented macules and patches at site or previous injury or inflammation - acne - psoriasis - lichen planus - atopic dermatitis - contact dermatitis - trauma All skin types More obvious in 4-6 skin types Lesions persist for months to years Treatment: hydroquinone or azelaic acid
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Nevi
``` Pigmented and no-pigmented tumors of the skin Contain nevus cells Any location on the body # increase with age Type/number genetically determined ``` Borders are regular and color even throughout lesion
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What is a mole?
A collection of nevus cells
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Keloids
``` Overgrowth of fibrous tissue Extends beyond the site of injury Can also occur spontaneously Family hx, genetic predisposition 4x more common in persons of afrobarribbean descent ```
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Where are the common sites of keloids?
Head, neck, chest, and arms Can be painful, itchy, stingy
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What is the treatment for keloid?
Topical steroids - gels, locations, creams, ointments Intralesional injections - kenalog, 5FU Surgical excision Recurrence is common
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What is the rule of thumb for hairs growing out of nevi?
If hairs grow out of nevi they are probably benign
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Epidermal cyst
“Balloon containing degraded skin contents” Nodule with central pore (punctum) Can originate from invagination of epidermis into the dermis or spontaneously
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What is the treatment for epidermal cyst?
Intralesions kenalog injection Incision and drainage Surgical excision
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Lipoma
Most common connective tissue tumor Occurs most commonly in middle and later aged adults F > M Locations: back, chest, abdomen, neck Cause - unknown Asymptomatic No treatment necessary - cosmetic surgery only reason usually
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What is the most common connective tissue tumor?
Lipoma
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Dermatofibroma
``` Very common F > M Trauma may play a major role -insect bites -folliculitis -injury to the skin ``` Painless, slow growing No treatment needed Surgery is curative - cosmetic reasons
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Acronchordons
Skin tags Soft tumors of normal skin Location: neck, axillae, groin Removal - cosmetic, irritation, and infection
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What is the treatment for skin tags?
(Aka acrochordons) Electrodessication (destruction) or surgical excision
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Hemangioma
Vascular abnormalities Not hereditary Present at birth or develop in infancy Can cause obstruction-eye, urogenital area, nose, mouth Spontaneous involution may occur after a few years Does not become cancerous No treatment needed unless bleeding: - systemic steroids - arterial embolization - surgery
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Neurofibroma
Most common type of neural sheathe tumor Nodular lesion located on the skin Consider evaluation for neurofibromatosis Neurofibromatosis - autosomal dominant - congenital and acquired tumors of CNS, skin, eyes, bones, endocrine glands, and Cafe au lait macules
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What is the most common type of neural sheath tumor?
Neruofibroma
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Actinic keratosis
``` Precancerous lesions Red scaly plaques located on the skin Occur on sun exposed areas - face, ears, hands, scalp Common in fair skinned 5-10% lesions become SCC ```
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What is the clinical sxs of actinic keratosis and how do you treat it?
Precancerous! Tender, burny or itchy, or even no sxs Tx: - cryosurgery - curettage - electrosurgery - topical chemotherapy
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What are the common locations for actinic keratosis?
Sun exposed areas - face, ears, hands, neck, scalp
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What are the malignant and precancerous lesions?
Actinic Keratosis BCC SCC Malignant melanoma
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What is the most common type of skin cancer?
BCC
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Where are the common locations to find BCC?
Face and neck
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What are the clinical manifestations of BCC?
Translucent papule or lesions that will not heal Become a large sore or ulcer that will not heal if untreated Very rare metastasis
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What is the second most common type of skin cancer?
SCC
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What age group is more likely to get SCC?
Pts over 50 Can have a genetic tendency to develop lesions
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Malignant Melanoma
Most DEADLY form of skin cancer Can metastasize to other organs ABCDE rule of melanoma
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What are the 4 types of malignant melanoma?
Acral lentiginous Nodular Superficial spreading Lentigo maligna 70% are superficial spreading type
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What is the treatment for malignant melanoma?
Same for all skin cancers - surgical excision - Mohs surgery - Electrodessication and curettage - not recommended - Cryosurgery - not recommended - Chemotheraperutic drugs - topical and oral
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"Test tubes in a row"
microscopic evaluation of PSORIASIS - epidermal acanthosis
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MC locations for psoriasis plaques?
extensor surfaces
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"beefy red"
intertrigo - candidiasis
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What is the treatment for intertrigo?
topical antifungals (clotrimazole, miconazole, nyastatin) steroids keep area dry
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Who gets intertrigo?
F > M DM Obese located in the skin folds
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Tense bullae
bullous pemphigoid treat with steroids