Tinea nigra is a very rare fungal infection that causes brown or black patches on the skin, usually on the soles of the feet or the palms of the hands. Read more here.
Tinea nigra presentation
Tinea Nigra Clinical Presentation: History, Physical Examination, Complications
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Tinea Corporis, Tinea Cruris, Tinea Nigra, and Piedra: Dermatologic Clinics August 2003, PDF, Medical Specialties
Tinea nigra
PDF] Dermoscopy revealing a case of Tinea Nigra*
Tinea nigra - wikidoc
Dark spots on child's back, black sites
Cureus, Interdigital Tinea Nigra