Chronic leg ulcer caused by Mycobacterium immunogenum.

Rare tropical skin diseases are seen more frequently in Western countries because of the increased popularity of visiting tropical regions. A 55-year-old white man developed a painless leg ulcer after traveling in Guatemala and Belize. A mycobacterium was cultured from a biopsy specimen and was identified as Mycobacterium immunogenum by 16S recombinant deoxyribonucleic acid sequence analysis. The leg ulcer healed after 6 months of compression therapy and hydrocolloids; a hypopigmented depressed scar remained.