Part 18 Flashcards
Leser trelat sign
A sudden increase in seborrheic keratosis #’s suggestive of internal malignancy in the body
Pyogenic granuloma
A benign acquired vascular lesion of the skin 2ndary to skin trauma, lobular and extremely friable
Dermatofibroma
Benign cell proliferation that appears like a wad of scar tissue that dimples down upon pinching, more common in females due to shaving trauma
Keloid treatment
Only intralesional steroids will help
Epidermal inclusion cyst
Mobile subcutaneous nodule often with overlying punctum that does NOT arise from sebaceous glands, have a foul smelling white discharge, sterile and do not require antibiotics
Milia
Tiny epidermoid cyst often on the face and tends to resolve in infancy but may persist if occur in adulthood
Skip areas
Spots of superficial basal cell carcinomas that remain low in the dermis and continue to replicate even after excision of all the visible lesion - can be avoided by performing mohs procedure to ensure excising what is missed
Important pre-existing factors when considering dermatologic procedure (4)
- anticoagulant/bleeding
- immunosuppression
- diabetes
- cardiovascular disease (the epi injection can be a big deal)
Shave vs punch vs excisional biopsy
- A shave takes a superficial layer and says nothing about the depth of the lesion, but can allow for wide excision, does not scar
- A punch biopsy is a deep incision all the way to the fatty layer of tissue to see how deep a lesion is
- excisional is removal of the entire lesion (diff from incisional which is partial), done in the case of suspect of melanoma within a few cm margins of extra spacing
PUVA
Combination of psoralen and UVA therapy used to treat skin conditions, with the psoralen making it more sensitive to the UV allowing for deep penetrating work on the skin
Actinic keratosis, if left untreated, can degranulate and turn into…
….squamous cell carcinoma
The key to painless lidocaine injections is….
….slow speed of injection with a small diameter needle
Cellulitis differs from erysipelas in that it…
…affects deeper dermis and sub Q opposed to the superficial dermis and has poorly demarcated borders
Necrotizing fascitis
Flesh eating, rapidly spreading infection of deep fascia with inflammation leading to necrosis, can be idiopathic or due to trauma or surgical wounds and has a mortality rate of 30% requiring surgical treatment and antibiotics quickly
Fournier’s gangrene
Necrotizing fasciitis of the perineum region
Predominant infection obtained from dog/cat bites
Pasteurella multocida
___% of cat bites become infected, ___% of dog bites do
80, 5
2 booster vaccines for animal bites
-tetanus -rabies
Pseudofoliculitis barbae
Refers to razor bumps of the beard
Nikolsky’s sign
Slight rubbing of skin resulting in exfoliation and wet appearance of skin indicating staph scalded skin syndrome
Community acquired MRSA vs Hospital acquired differentiaion
Considered community acquired if not undergone any medical procedure or hospitalized within the past year
CA (3) and HA (2) MRSA treatment
Community: -Sulfamethoxazole (bactrim) -tetracyclines -clindamycin Hospital: -vancomycin -linezolid
Ways to test for fungal infections (3) and which is the gold standard
-KOH prep -culture (gold standard but takes time) -woods lamp
Cornyebacterium minitussiumm
Causes erythasma, and is NOT a fungus but fluoresces with a woods lamp with a bright coral red color
All types of tinea respond to the same oral and topical agents except…
…tinea versicolor
“one hand, 2 feet syndrome”
Refers to moccasin type presentation of tinea pedis where an affected hand shows unilateral scalingin creases and indicates to look at feet for tinea pedis
Pitted keratolysis and what is the recommended treatment
A bacterial in origin condition often mistaken for tinea pedis or plantar warts that has much lowered severity of itchiness and pain and appears as little pitted spots on soles of feet, treated with drysol (aluminum chloride)
Tine corporis treatments (2)
-Topical antifungals for at least 2 weeks (sue even if goes away visually) -oral antifungals if resistant but watch liver function
If dermatitis is treated with topical steroids, it will initially appear ___ and this is called ____
better, tinea incognito
___ agents do not work for tinea capitis
TOPICAL
Inflammatory tinea capitis is a dermotologic emergency because…
…it can lead to permanent balding and scarring
Tinea versicolor (pityriasis versicoor)
A yeast infection not a dermatophyte, can cause some itching and can appear very variantly but does not have visible scale until rubbed with finger or scalpal blade (differentiates from tinea corporis)
Tinea versicolor (pityriasis versicolor) treatments (3)
-Topical shampoos (selenium sulfide) -imidazole creams -oral medications such as fluconazole but monitor liver
Seborrheic dermatitis
Also known as dandruff, common inflammatory rxn to eyast that thrives on seborrheic skin and causes inflammation to normal flora, chronic condition that can be controlled but not cured
Seborrheic dermatitis treatments (2)
-Topical shampoos (selenium sulfide) -imidazole creams
Diaper candidiasis treatments (1) and what treatment should be avoided
-nystatin cream Combination therapieswith high potency steroids
Keratolytic agents
Drugs that promote the shedding of the stratum corneum layer of skin causing peeling to extensive desquamation
Salicylic acid drug class and function
Keratolytic agent, promotes desquamation by disllolving intracellular cement that binds scales to stratum corneum used in low conc. to treat dandruff, seborrheic dermatitis, acne, psoriasis, warts, and corn
Salicylic acid ADR
-salicylism (same as in aspirin thru absopriton of skin) casuing tinnitus and hyperpnea
Benzoyl peroxide function
First line drug employed topically to treat mild to moderate acne, penetrates stratum corneum or follicular openings unchanged converted metabolically within epidermis promoting keratoysis and suppressing growth of P. acnes (does not cause resistance)
Dapsone function
Topical agent that provides modest decrease in inflammation often as an alternative to benzoyl peroxide
Tretinoin drug class and function
Retinoids, derivatives of vit A, approved for treatment of mild to moderate acne thru decreasing cohesion between epidermal cells remove existing comedones aand preventing formation of new plugs
Isotretinoin (accutane) ADR’s (7)
- nosebleeds
- inflamation of lips
- dryness and itching of skin, nose and mouth
- loss of night vision
- UV sensitivity
- psychological effects
- teratogenic during pregnancy
iPledge program
FDA mandated program to manage accutane related teratogenicity requires 2 active forms of birth control
Methotrexate drug class and function
Immunosuppressent, cytotoxic agent that targets tissues with high growth rate, only should be used when severe psoriasis has not responded to safer therapy
Methotrexate ADR’s
- systemic administration can result in toxic effects
- GI effects
- bone marrow suppression
Cyclosporine drug class and function
Immunosuppressant that can treat moderate to severe psoriasis
Tumor necrosis factor antagonsists function
Inhibition of TNF suppresses immune function reducing inflammation in psoriais, very effective but can increase risk of opportunistic infections
Interleukin 12/23 antagonists function
Human monoclonal antibody directed againast interleukins 12 and 23 that promte inflammatory response, to decrease psoriasis
Ketoconazole function
Antifungal cream and shampoo for seborrheic dermatitis
Finasteride (propecia) drug class and function
5-a reductase inhibitor, Indicated for treatment of hair loss of males, inhibits conversion of testosterrone to DHT causing decrease in DHT conc. in scalp
Flurouracil function
PO antineoplastic agent used for topical treatment of multiple actinic keratoses and superficial basal cell carcinoma thru interupting DNA and RNA synthesis
Tacrolimus (protopic) oitnment drug class and function
Calcineurin inhibitor (immunosuppressent) used to treat severe atopic dermatitis by reducing local immune response
UVA vs UVB
UVA is 95% of terrestrial UV radiation and penetrates skin much more deeply causing most skin aging, UVB is 5% and main cause of tanning and sunburn