<prompt> Causative agent of Black piedraTrichosporon beigeliiTrichosporon asahiiPiedra hoaeTrichosporon cutaneum  <response>: Piedra Superficial infection of hair shaft where fungal elements adhere to form nodes along hair shaft. Two types: black piedra and white piedra . Black piedra:- Caused by Piedraia hoae; presents with tiny dark concretions on hairs shafts distributed irregularly; culture shows black velvety colony. White piedra:- Trichosporon cutaneum formerly T. beigelii most common; other species include T. ovoides, T. inkin, and T. asahii; presents with light brown, less adherent nodules coating hair shaft beard, axilla, pubic hairs. Of note, T. cutaneum can cause fungemia with systemic disease in immunocompromised patients. Treatment:- shavingcutting hair, topical imidazoles. Ref:- Sima Jain; pg num:- 226 