disease has location piedra piedra, black SCTID:402135006 MEDGEN:45923 piedra, White UMLS:C0031898 White piedra Either of two diseases resulting from fungal infection of the hair shafts. Black piedra occurs mainly in and on the hairs of the scalp and is caused by Piedraia hortae; white piedra occurs in and on the hairs of the scalp, beard, mustache and genital areas and is caused by Trichosporon species. Piedras, black steroid-modified tinea infection hair shaft fungal infectious disease MONDO:0000253 Piedras White Piedras Piedras, White black piedra black Piedras MESH:D010854 fungal infectious disease disorder of pilosebaceous unit superficial mycosis skin appendage disorder hair shaft