last flex case Flashcards
Scaly, annular, erythematous plaques on glabrous skin. Borders are raised, with outer edge active and scaly** (leading edge scale)**.
tinea corporis (ringworm)
+/- central clearing. Positive KOH (visualized septate hyphae, long and straight or wavy)
tinea corporis dx
type 4 hypersensitivity; Indurated, smooth, raised border, nonscaly, skin colored annular plaques and papules, usually on the extremities; typically asymp. & more in females before 4th decade
granuloma annulare
Small, fawn-covered, oval patches with fine, trailing edge scales, following the cleavage lines. Begins with a “herald patch” (AKA Christmas Tree pattern) and occurs fall & spring.
pityriasis rosea
tx of pityriasis rosea
topical or systemic steroids
UVA & UVB
Well circumscribed annular, nonscaly, plaques (wheals), with raised borders and blanched centers. Highly pruritic. Last 90 min-24 hrs
urticaria
the application of topical glucocorticoids to an unrecognized fungal infection. As a result, the clinical appearance of the initial rash is altered, becoming less scaly, more extensive, pustular, and pruritis
tinea incognito
often waxes and wanes with winter; may improve with sun or humidity exposure or with moisturizer use. Does not involve face or scalp; coin-shaped plaques often on extremities
nummular eczema
1+ annular or oval erythematous patches as a result of systemic exposure to a drug; resolve w/ hyperpigmentation left; recurs at same spot with rexposure to drug
fixed drug eruptions
rosacea tx
topical metronidazole
rosacea may look like SLE
lesion isnt very impressive in features but on exam theres a “notch” in the superior pole, as well as some mild degree of pigment heterogeneity
malignant melanoma in situ
Superficial benign fibrous histiocytoma- common solitary cutaneous, hard nodule; more common on LE and asymptomatic; dimple sign
dermatofibroma
2 tx for dermatofibroma
reassurance unless rapidly enlarging
surgical elliptical excisional biopsy
when do you refer an AK (7)
- Failed cryotherapy
- Painful or growing
- Pigmented changes
- Hyperkeratotic
- Young patient w/ AK
- Near a previous skin cancer scar
- Hard to treat location (lips, ears, etc.)
XRT is a RF of which carcinoma while tanning bed is a RF of which?
XRT— BCC
tanning bed– SCC