Derm

Question 1

painful, target lesions following an infection (usually HSV). Often involves mucosal area or palms/soles

Answer 1

Erythema Multiforme (tx symptomatic)

Question 2

common conditions associated w/erythema nodosum

Answer 2

Streptococcal pharyngitis
Sarcoid
TB
Fungal (cocci/histo/blasto)
IBD
Pregnancy/OCP use

Question 3

violaceous, polygonal papules

Answer 3

Lichen planus (can have Wickham striae- white lines within the lesion

Question 4

tx scabies

Answer 4

topical permethrin

oral ivermectin

Question 5

tx shingles

Answer 5

1) Valacyclovir w/in 72h and for 7 days
2) Pain control
3) Zoster vaccine
* *steroids not indicated

Question 6

h/o Hep C, develops blisters w/sun exposure

Answer 6

porphyria cutanea tarda (increased serum uroporphyrinogen)

tx: avoid triggers (EtOH, estrogen), phlebotomy

Question 7

which has (+) Nicholsky, oral involvement, generally worse? pemphigus vulgaris or bullous pemphigoid

Answer 7

pemphigoid vulgaris (tx: systemic steroids, +/- immunomodulator)

Question 8

child with salmon-colored patch followed by multiple plaques in “Christmas-tree” formation

Answer 8

pityriasis rosea

tx: self-resolves, symptomatic

Question 9

skin infection, most commonly S. pyogenes

painful, well-defined demarcation

Answer 9

Erysipelas (upper dermis, superficial lymphatics)

tx. oral PCN, IV ceftriaxone/cefazolin

Question 10

diseases associated w/skin tags

Answer 10

insulin resistance
pregnancy
Crohns (polyps/ perianal disease)