Micro Cutaneous Fungal Infections

Question 1

Superficial mycoses

Answer 1

Outermost layer of skin

-Tinea Nigra, Tinea versicolor, white piedra, black piedra

Question 2

cutaneous mycoses

Answer 2

• Dermatophytes: Trichophyton spp, Microsporum spp, Epidermophyton
• Tiena (PEDIS, CRURIS, CAPITIS, barbae, ungium)

Question 3

subcutaneous

Answer 3

Involves dermis, muscle, etc

Question 4

Tinea Nigra (Exophiala wernickii/ Hortaea wernickii) Clinical

Answer 4

• Brown/black macules on palms/ soles
• Asymptomatic
• Only dead tissue colonized (no immune response)

Question 5

Tinea Nigra (Exophiala wernickii/ Hortaea wernickii) Etiology

Answer 5

-Produces melanin

Question 6

Tinea Nigra (Exophiala wernickii/ Hortaea wernickii) Lab findings

Answer 6

• Black two-celled oval yeast

- PAS stain?

Question 7

Pityriasis Versicolor ( Malassezia) Clinical

Answer 7

-Scaly hypo/hyper-pigmented patches on torso and limbs

Question 8

Pityriasis Versicolor ( Malassezia) Lab findings

Answer 8

• Lipophylic yeast
• “Spaghetti and meatballs”
• Hyphae on microscope

Question 9

Pityriasis Versicolor ( Malassezia) Diagnosis

Answer 9

Observation

Question 10

White Piedra Clinical (Trichosporon sp)

Answer 10

Cream/yellow nodules on ANY hair

Question 11

Black Piedra (Piedraia hortae) Clinical

Answer 11

• SCALP hair
• Hard/gritty/black/brown nodules
• Contain asci (spore sacks)

Question 12

Black Piedra (Piedraia hortae) Location

Answer 12

Tropics

Question 13

Dermatophytes: Trichophyton spp, Microsporum spp, Epidermophyton Transmission

Answer 13

Person-Person via fomites (anthropophilic), zoophilic, Geophilic (soil)