Tinea Nigra

Question 1

Tinea nigra is an infection of

Answer 1

keratinized layer of skin caused by Exophiala werneckii or Cladosporium werneckii

Question 2

Cladosporium werneckii

Answer 2

is a dimorphic fungus that produces melanin

Question 3

The fungus on the SDA grows as

Answer 3

yeast with many cells in various stages of cell division producing typical two-celled oval structure, on primary isolation from clinical specimen.

Question 4

On prolonged incubation

Answer 4

elongated hyphae develop and in older cultures, mycelia and conidia are predominantly found

Question 5

Typical manifestation of the condition

Answer 5

A well-demarcated brown-black macular lesion, which appears as brownish spot of the skin

Question 6

These brownish to black lesions are most commonly seen on

Answer 6

palms and soles

Question 7

Laboratory diagnosis of tinea nigra is made by

Answer 7

microscopy of the KOH preparation of skin scrapings collected from the affected part

Question 8

What is demonstrated in microscopy of the KOH preparation of skin scrapings

Answer 8

Typical darkly pigmented yeast-like cells and hyperfragmented hyphae are demonstrated

Question 9

What confirms the diagnosis

Answer 9

Culture of the skin scraping on the SDA confirms the diagnosis