Fungal Skin Infections

Question 1

Organism causing tinea corporis

Answer 1

Trichophyton rubrum

Question 2

Organism causing tinea versicolor

Answer 2

Malessezia (Pityrosporum)

Question 3

Tx of tinea versicolor

Answer 3

SeS, ZnP shampoo, soaps, topical ketoconazole

Question 4

Pathology of malassezia

Answer 4

Dimorphic - hyphae when pathogenic (TV), yeast when colonizing (seborrheic dermatitis)

Question 5

Dx of candidiasis

Answer 5

Spores and pseudohyphae on KOH

Question 6

Features of candidiasis

Answer 6

Scrotal involvement, satellite macules and pustules, lack of annular morphology (like in tinea cruris)

Question 7

Diaper dermatitis

Answer 7

Irritant contact dermatitis, seborrheic dermatitis, psoriasis

Question 8

Tinea capitis

Answer 8

Affects hair follicles; itching; hair loss

Question 9

Seborrheic dermatitis

Answer 9

Inflammatory reaction to malassezia yeast

Question 10

Sporotrichosis

Answer 10

Subcutaneous infection, starts with single nodule, ulceration, then nodular chain along lymphatics

Question 11

Chromoblastomycosis

Answer 11

Seen in tropics, agricultural workers, injury

Question 12

Mycetoma

Answer 12

Can be fungal or bacterial, slowly progressing, starts with foot wound; triad of edema, sinuses, granules

Question 13

Pathology of sporotrichosis

Answer 13

Asteroid body in yeast