A skin lesion of blastomycosis is a symptom of an infection with the fungus Blastomyces dermatitidis. The skin becomes infected as the fungus spreads throughout the body.
Causes, incidence, and risk factors
The fungus enters the body through the lungs, infecting them. In some people, the fungus then spreads (disseminates) to other areas of the body. The infection may affect the skin, bones and joints, genitourinary tract, and other systems. Skin symptoms are a sign of widespread (disseminated) blastomycosis.