Dermatology 5% Flashcards
lesh-colored, pink or yellow-brown lesion with a rough sandpaper feel
Occurs on sun-exposed surfaces and is a precursor to squamous cell carcinoma
Actinic keratosis
Treat with observation (many resolve on their own), cryosurgery, 5 FU cream, electrodesiccation or Imiquimod
autoimmune - attack against hair follicles. Onset usually prior to 30 years of age; men and women are equally affected. Well-documented genetic predisposition.
Alopecia areata
Scalp disorder characterized by the thinning or shedding of hair resulting from the early entry of hair in the telogen phase (the resting phase of the hair follicle)
Telogen effluvium
Alopecia is preceded by a psychologically or physically stressful event 6–16 weeks prior to the onset of hair loss.
white waxy lump or a brown scaly patch, raised pearly and rolled borders, telangiectasis, a central ulcer on sun-exposed areas, such as the face and neck
BCC
basal cells
Basal cells produce new skin cells as old ones die. Limiting sun exposure can help prevent these cells from becoming cancerous
How to treat BCC?
fluorouracil (FU) and imiquimod, photodynamic therapy (PDT), and surgical excision with clear margins
autoimmune subepidermal blistering skin disorder caused by linear deposition of autoantibodies (IgG) against hemidesmosomes in the epidermal-dermal junction
(-ve) Nikolsky sign
Bullous pemphigoid is less severe than pemphigus vulgaris, does not affect mucous membranes and has a negative Nikolsky sign
Dx of bullous pemphigoid
Diagnosis is made by skin biopsy with direct immunofluorescence exam shows deposition of IgG and C3 basement membrane
Treat with systemic corticosteroids
large number of pruritic, tense, subepidermal bullae across her upper thighs. There was no mucosal involvement and skin biopsy showed subepidermal bullae filled with eosinophils and neutrophils.
Bullous pemphigoides
treatment for bullous pemphigoides
High-potency topical corticosteroids (eg, clobetasol 0.05% cream) should be used for localized disease and may reduce the required dose of systemic drugs.
Prednisolone (an anti inflammatory agent) and azathioprine (an immunosuppressant) can also be used in the treatment of bullous pemphigoid.
nicotinamide is used in combination with tetracycline or erythromycin to treat bullous pemphigoid
Dapsone Is particularly effective in mucous membrane lesions.
Acute bacterial skin and skin structure infection of the dermis and subcutaneous tissue;
characterized by pain, erythema, warmth, and swelling. Margins are flat and not well demarcated.
Caused by Staphylococcus and Streptococcus in adults
H. influenzae or strep pneumonia in children
Cellulitis
Mild cellulitis treatment MSSA
Cephalexin or Dicloxacillin
How to treat MRSA cellulitis?
Trimethoprim-sulfamethoxazole (TMP-SMZ) 1 DS tab PO BID
Clindamycin 300–450 mg PO
Doxycycline 100 mg PO BID
IV Vancomycin or Linezolid
an indication for workup in patients with suspected cellulitis?
Tachypnea
Flesh-colored, cauliflower appearance genital warts caused by HPV types 6 and 11
Condyloma acuminatum (also known as genital warts or anogenital warts) refers to an epidermal manifestation attributed to the epidermotropic human papillomavirus (HPV)
well-demarcated erythema, erosions, vesicles
contact dermatitis
Allergic: Type 4 hypersensitivity
Nickel, poison ivy
Tx for contact dermatitis?
Avoid offending agent. Burrow’s solution (aluminum acetate), topical steroids, zinc oxide (diaper rash)
Pruritic, eczematous lesions, xerosis (dry skin), and lichenification (thickening of the skin and an increase in skin markings). Most common on flexor creases (ex. antecubital and popliteal folds)
Atopic dermatitis
IgE, Type 1 hypersensitivity
TX with:
Topical corticosteroids and emollients, topical calcineurin inhibitor (ie, tacrolimus or pimecrolimus)
Coin-shaped/disc-shaped
Treat with?
Nummular eczema
Tx: High- or ultra-high potency topical corticosteroids, phototherapy, systemic corticosteroids, methotrexate, cyclosporine
Erythematous, yellowish greasy scales, crusted lesions.
Infants- scalp (cradle cap)
Adults/adolescents- body folds
Seborrheic dermatitis
Scalp: antifungal shampoo
Face: low potency steroid cream
Treatment for seborrheic dermatitis?
Ketoconazole shampoo
What is treatment for perioral dermatitis?
Topical metronidazole
erythromycin
Topical steroids are contraindicated as they may cause flare of lesions
Acrylates and methacrylates have been significantly associated with contact allergy and allergic contact disease
T/F
True
acrylic nail sources and wound dressings represent emerging sources of sensitization. A separate study found that acrylates and methacrylates were significantly associated with allergic contact dermatitis.
Potassium hydroxide preparation or fungal culture is often indicated to exclude tinea in dermatitis of the hands and feet
T/F
T
Potassium hydroxide preparation and/or fungal culture to exclude tinea are often indicated for dermatitis of the hands and feet. This helps identify disorders such as tinea pedis.
why Patients should avoid using topical antihistamines, including topical doxepin w/ contact dermatitis?
because of the risk for iatrogenic allergic contact dermatitis to these agents; additionally, sedation can occur if large amounts of doxepin cream are applied.
Shorter courses of corticosteroids may allow poison ivy dermatitis to relapse
T/F
True
what is contraindicated as treatment for genital warts in pregnancy?
Podophyllum resin
Condylomata acuminata is caused by
HPV
Young women. Papulopustular, plaques, and scales around the mouth.
Treatment
Perioral dermatitis
Treatment: Topical metronidazole, avoid steroids
What is the correct dosage of epinephrine for the actute treatment of anaphylaxis?
epinephrine 0.2–0.5 mg (1:1000 [1 mg/mL] solution) IM every 5–15 min prednisone may be given to prevent recurrence.
a pruritic vesicular eruption comprised of clear, deep-seated vesicles without erythema erupting on the lateral aspects of fingers, the central palm, and plantar surfaces.
Tapioca pudding
dyshidrosis
Tapioca vesicles on hands and feet following stress or hot humid weather
1st line treatment for dyshidrosis
Topical HIGH STRENGTH steroids and cold compress
raised, edematous, circumscribed, hot, erythematous area, with or without vesicles or bullae frequently involving the central face or lower extremity.
Erysipelas
is a type of superficial cellulitis with dermal lymphatic involvement
Looks like cellulitis but it is well-demarcated and caused by group A strep (strep pyogenes)
Must rule out MRSA
primary etiological agent of erysipelas is
Beta-hemolytic streptococcus
MILD Erysipelas Treatment?
Mild can be treated with Penicillin G
Patients with allergy to penicillin can be treated with erythromycin or clindamycin
Moderate erysipelas Treatment>
Trimethoprim-sulfamethoxazole (TMP-SMX)-DS: 1–2 tablets PO BID AND penicillin VK 500 mg PO QID
or
cephalexin 500 mg PO QID
Severe erysipelas treatment?
IV and linezolid 600 mg IV/PO BID or vancomycin IV or daptomycin 4 mg/kg IV q24h.
Skin lesions predominantly involving the extremities (hands, feet, and mucosa). Target-like shape, raised, blanching, and lack of itchiness help characterize this rash.
Erythema multiforme (EM) is an acute, self-limited, and sometimes recurring skin condition that is considered to be a type IV hypersensitivity reaction
ASsociated with:
HSV
Sulfa drugs
The most common cause of erythema multiforme minor is
HSV
EM major (involvement of mucous membranes and systemic signs)
Symptomatic treatment with oral antihistamines and topical corticosteroids for mild cases; mouthwashes or topical steroid gels for oral disease.
EM minor (no mucous membrane involvement and no systemic signs) is usually self-limited
Supportive care
Early treatment with acyclovir may lessen the number and duration of cutaneous lesions for patients with coexisting or recent HSV infection.
The child has had a low-grade fever, headache, and sore throat for the past week. Four days ago, he suddenly developed a bright red rash on his cheeks, which during the past 2 days has spread to the trunk, arms, and legs.
DX
5th disease
MCC: Parvovirus-B19
Diagnosis is based primarily on clinical observations, history, and physical exam
Serology: associated with ENLARGED nuclei with peripherally displaced chromatin
PARVO B19-specific IgM antibodies and PCR
Erythema
Migrans
Lyme disease
Erythema MARGINATUM
Rheumatic fever
Erythema NODOSUM
Mono
Erythema
Infectiosum
Parvovirus-B19 ;
5th disease
MCC of hand foot mouth disease?
Coxsackie VIRUS type A
children< 10 years old with vesicles on pharynx, mouth, hands, feet
sores in the mouth and a rash on the hands, feet, mouth, and buttocks
hand foot mouth disease
The virus usually clears up on its own within 10 days
Treatment is supportive, anti-inflammatories