Black piedra

Black piedra

piedra involving the hairs of the scalp, caused by piedraia hortae and characterised by firmly adherent black, hard, gritty nodules composed of an organised, firmly cemented mass of fungus cells; the fungal growth is always located above the level of the hair follicles; the disease occurs in humid tropical countries of the americas, Africa, Southeast asia, and indonesia, and attacks chimpanzees and other primates as well as humans.

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