Fungal and Parasitic Skin Infections

Assoc.Prof.Dr.Yeşim Gürol

Tinea pedis (Athlete’s foot)

Disease Etiological Agent  Symptoms  Identification of organism

Pityriasisversicolor 

Malassezia furfur

hypopigmented macules 

"spaghetti and meatballs" appearance of organism in skin scrapings

Tinea nigra 

Exophiala werneckii  black macules black, 2-celled oval yeast in skin

scrapings 

Black piedra 

Piedraia hortai

black nodule on hair shaft 

black nodule on hair shaft composed of spore sacs and spores 

White piedra 

Trichosporum beigelii 

creme-colored nodules on hair shaft 

white nodule on hair shaft composed of mycelia that

fragment into arthrospores

tinea capitis tinea barbae tinea corporis tinea cruris tinea unguium tinea pedisThe three most common dermatophytes areMicrosporum, Trichophyton, and Epidermophyton. Theyproduce characteristic asexual reproductive spores called macroconidia and microconidia

Sporothrix schenkii

body louse, Pediculus humanus,head louse, P. humanus capitisThe pubic or crab louse, Phthirus pubis

Scabies

Scabies (right) is very easy to misdiagnose because early subtle cases may look like small pimples (left) or mosquito bites (center).

Demodex folliculorum