Mycetoma

Mycetoma is a chronic skin infection which typically affects the feet, but may develop in other areas. The condition initially consists of a solitary, hard lump which is painless. The lesion grows slowly, and eventually collapses in the center, becoming ulcerated and discharging fluid and grains. Sinus tracts may then form around the lesion, which also experience the same discharge. The color of grains in discharge is predicated on the species of the infectious organism, and may be black, white, yellow, or red/brown. Lesions may grow to involve deep tissue and even bone, and the skin in the affected area will be pale and scarred. The condition may lead to severe deformity, though it is not often accompanied by other symptoms aside from mild itching or burning. The condition is prone to secondary infection.

Mycetoma is caused by a bacterial or fungal infection, typically at the site of an injury. The condition is much more common in men, and usually appears in persons 20-50 years old.

Differential Diagnosis (Other conditions with similar appearance)Chromoblastomycosis
Mycobacterium infection
Tuberculosis
Hansen disease
Syphilis
Aspergillosis
Botryomycosis
Thorn granuloma
Fibrolipoma
Neurofibroma
Necrotizing fasciitis
Cold Abscess

Mycetoma is diagnosed based on the identification of grains in discharge from the lesion through laboratory testing. A skin biopsy may be performed to confirm the diagnosis and to rule out other, similar appearing conditions.