Histoplasmosis.

Histoplasmosis is an infection caused by the dimorphic fungus, Histoplasma capsulatum. The initial site of entry is usually the lung, but dissemination to skin occurs in some patients, particularly those with human immunodeficiency virus (HIV) infection in whom it is part of a widespread infection. The organisms have to be distinguished from other yeasts in skin such as Cryptococcus neoformans and small forms of Blastomyces dermatitidis.