III. SUPERFICIAL MYCOSES

Question 1

Caused by Malassezia furfur

Answer 1

Tinea versicolor

Question 2

skin infection characterized by superficial, brownish, scaly areas onlight-skinned individuals and lighter areas on dark-skinned people.

● lesions occur on the smooth surfaces of the body, namely, the trunk, arms,
shoulders, and face

Answer 2

Tinea versicolor

Question 3

useful in mild cases of dermatophytosis,
including tinea versicolor

Answer 3

Clotrimazole and Miconazole

Question 4

available commercially, provide antifungal
activity against Malassezia furfur, the causative agent of tinea versicolor.

Answer 4

Selenium sulfide shampoos

Question 5

for tinea versicolor may show golden-yellow fluorescence

Answer 5

Woods lamp examination

Question 6

a superficial skin infection caused by Hortaea werneckii

Answer 6

Tinea nigra

Question 7

manifested by blackish brown, macular patches on the palm of the hand or the sole of the foot

Answer 7

Tinea nigra

Question 8

Tinea nigra

Lesions have been compared with ______________ of the skin.

Answer 8

silver nitrate staining

Question 9

Tinea nigra
● ____________________, the causative agent of tinea nigra, may be recovered on common fungal media but grows ____________.
● Initial colonies of H. werneckii may be _________, shiny, and yeastlike and usually grow____________. As the cultures age, colonies become filamentous, with ______________.

Answer 9

H. werneckii

very slowly

olive to black

within 2 to 3 weeks

velvety gray aerial hyphae

Question 10

Fungal infection of the hair, scalp, and occasionally the axillary and pubic hair caused by the dematiaceous fungus Piedraia hortae

Answer 10

Black piedra

Question 11

Black piedra

gently heated for nodules composed of cemented mycelium. Crushing the mature nodules reveals _____asci, containing ______ aseptate ascospores, 19 to 55 mm long by 4 to 8 mm in diameter. The asci are _______ and have a filament at each pole.

Answer 11

Oval
2 to 8
Spindle-shaped

Question 12

P. hortae is easily cultured on any fungal culture medium ________________. Colonies are very slow-growing, appear ______________, and produce aerial mycelium. Some isolates may produce a _________ diffusible pigment.

Answer 12

lacking cycloheximide
dark brown to black
red to brown

Question 13

White piedra

Answer 13

Trichophyton

Question 14

characterized by the development of soft, yellow or pale brown aggregations around hair shafts in the axillary, facial, genital, and scalp regions of the body

Answer 14

White piedra

Question 15

observed using the potassium hydroxide (KOH) preparation

Answer 15

White piedra