Dermatology Flashcards
macule vs papule vs patch vs plaque
Macule: flat, diff color 1cm
Plaque: elevated solid, >5mm
anaphylaxis, drug rxn: type of rxn, mechanism
Type 1, Antigen and IgE crosslink
Autoimmune hemolytic anemia, rheumatic fever: type rxn, mech
Type II, IgM, IgG bind and complement phagocytosis
SLE, polyarteritis nodosa: type, mech
III, immune complex activate complement
TB test, contact dermatitis: type, mech
IV, delayed, sensitized t cel
Pityrosporom ovale: type of organism, what causes
yeast, seb derm
Drug erruptions: time line and typical appearance
7-14 d after exposure
widespread, symmetrical, pruritic
SJS vs TEN: criteria and bx
SJS: 10% BSA, degen basal layer
TEN: >30%, full thickness eosinphilic epidermal necrosis
Workup for erythema nodosum
ASO titer, PPD, CXR (sarcoidosis), small bowel (IBD)
Bullous pemphigoid vs pemphigus vulgaris: anatomy affected, type of blister, mucosal involvement, nikolvsky sign
BP: basement membrane, anti-BP antigen, firm stable blisters, neg Nikolsk
PV: intraepidermal, anti-desmoglein, erosions, + nicolsky, mucosal involvement common
Appears as red vesicles at all stages, palms and soles spared
chicken pox
Small pink papules on the trunk, fever, GI: causative agent and tx
Salmonella typhi
fluoroquinalones and 3rd gen cephalosporins
Tx of nec fasc
surgical emergency
Abx: penicillin G or clinda for strep
metronidazole or 3rd gen cephalosporin for anaerobic
Tx and causative organism: tinea versicolor
malassezia furfur
Ketoconazole or selenium sulfide
Treatment of scabies
overnight with 5% permethrin from neck down, oral ivermectin
