Superficial Mycoses of skin

Question 1

black piedra caused by?

location

Answer 1

piedra hortae
- on hair shaft

found in south america

Question 2

black piedra transmission

Answer 2

p2p
m2p
fomite

Question 3

pathogenesis of black piedra

Answer 3

by piedra hortae

mycelial nodular swellings along axis of hair shafts– hair weakens and breaks off t to keratinolytic activity

Question 4

immunity to piedra hortae?

Answer 4

NO

Question 5

s/s black piedra

Answer 5

by piedra hortae

gritty encrustations of painless encrustations of shafts of head

Question 6

tx black piedra

Answer 6

Selenium sulfate

Question 7

white piedra caused by

Answer 7

trichosporon ovoides

Question 8

epi of white piedra

Answer 8

trichosporon

• world wide in stagnant water and soil, normal flora of humans

Question 9

transmission white piedra

Answer 9

p2p
m2p
fomite

Question 10

pathogenesis white piedra

Answer 10

by trichosporon

mycelial nodular swellings along axis of hair shafts– hair weakens and breaks off t to keratinolytic activity

Question 11

tx white piedra

Answer 11

selenium sulfide

Question 12

dx white piedra

Answer 12

hair shafts have conydia with white nodules

hyaline septate hyphae broken into arthrospores

Question 13

tinea versicolor caused by

aka pytriasis versicolor

Answer 13

malassezia furfur (MOST COMMON ONE)
- lipophilic fungus on skin

Question 14

epi of tinea versicolor

transmission

Answer 14

worldwide human non human

p2p, m2p, fomite

Question 15

Pathogenesis of tinea versicolor

predisposition by?

Answer 15

malasezia furfur

superficial fungus feeds on skin oil and removes the stratum corneum layer of skin – resulting in turnover of outer epithelium

oil emulsion, high cortisol high temp and humidity

Question 16

partial immunity to tinea versicolor

Answer 16

NO

Question 17

s/s of tinea versicolor

Answer 17

by malasezia furfur

light people- red brownish blotchy scaly lesions - hypo or hyper pigmented
dark people– pinkish white patches

infection can develop as well as atopic dermatitis

Question 18

dx of tinea versicolor

Answer 18

by malasezia furfur

spaghetti and meatballs colonies

Question 19

tx of tinea versicolor

Answer 19

Ketoconazole

Question 20

tinea negra caused y

Answer 20

Hortatea Wernickii

Question 21

epi of tinea negra

Answer 21

by hortatea wernikki

worldwide in stagnant water soil , flora of p and m

p2p m2p fomite

Question 22

pathogenesis of tinea negra

Answer 22

by hortatea werniki

feeds of stratum corneal layer of hands and feet

Question 23

protective immunity of tinea negra

Answer 23

no

Question 24

s.s of tinea negra

has to be differentiated from???

Answer 24

by hortatea werniki

brownish black non scaly painlessly macule

differentiated from- Malignant melanoma

Question 25

dx tinea negra

Answer 25

branched septate with dark pigmented hyphae and elongated budding cells

Question 26

tx tinea negra

Answer 26

myconazole