KOH and bugs

Question 1

scabies: cause, transmission, where on body, signs, tx

Answer 1

parasitic skin mite. skin to skin transmission. pustules in “warm” areas of body. Linear burrows. topical permethrin

Question 2

erythema migrans: what is it? classic presentation for___, caused by __ and transmitted by___

Answer 2

Initial red macule expands to form annular lesion with partial clearing (targetoid). lyme dz, borrelia burgdorferi, tick

Question 3

What three groups of cutaneous fungi cause superficial infections

Answer 3

dermatophytes (tinea), malassezia, candida

Question 4

arthrospores inside hair shaft

Answer 4

tinea capitis

Question 5

griseofulvin

Answer 5

systemic anti fungal

Question 6

one hand, two feet of scaling, redness

Answer 6

moccasin type tinea pedis

Question 7

onychomycosis

Answer 7

complication of tinea pedis. chronic fungal infection of nailbed.

Question 8

annular lesion with central clearing

Answer 8

tinea corporis (ringworm)

Question 9

summer presentation, areas that do not tan, alcohol use. Well demarcated pink and tan patches across back. Evoked scaling

Answer 9

tinea (pityriasis) versicolor

Question 10

tinea versicolor caused by spp.? characteristic microscopy pattern?

Answer 10

malassezia (only tinea not caused by dermatophytosis). Spaghetti and meatballs

Question 11

angry red plaques with fine white scale around groin. creases are involved. satellite papules

Answer 11

diaper candidiasis

Question 12

diaper rash which spares skin folds.

Answer 12

irritant diaper dermatitis

Question 13

candidal intertrigo

Answer 13

candidiasis of large skin folds (breasts, fat)

Question 14

superficial pyodermas: most common cause

Answer 14

s. aureus

Question 15

bullous and non-bullous impetigo: usually caused by

Answer 15

Staph a. exotoxin (exfoliative toxin a &b) (systemic exotoxin results in SSSS)

Question 16

SSSS is caused by what? How does that produce blisters?

Answer 16

exfoliative toxins for staph aureus. Bind to desmoglein-1

Question 17

white then red strawberry tongue, exanthem: red snadpaper rash, worse in folds. Desquamation after 4-5 days

Answer 17

scarlet fever. strep pyogenes

Question 18

erythematous warm plaque. ill defined borders. tender. fever

Answer 18

cellulitis. usually gram + organism

Question 19

erysipelas

Answer 19

cellulitis that involves dermis cause=ing it to be raised

Question 20

small papules on ertythematous base with central hair

Answer 20

folliculitis. staph a.

Question 21

carbuncle

Answer 21

coalescence of several inflamed furuncles.

Question 22

secondary syphilis: causative spp. where?

Answer 22

trep. palidu,. palm and sole involvement