Sometimes the ulcer will heal itself, but usually does so in a disconfiguring way. Antibiotics have not yet worked. Treatment is expensive, and long. No race is immune. It is not communicable from patient to patient.
Environmental factors appear to play a role.
Ghana's Noguchi Memorial Institute for Medical Research is playing a lead research role with the US Centers for Disease Control. April 29, 2001. Go to story. The architecture is a bit reminiscent of the American Southwest. Much of the region is Islamic.