The lesions begin as erythematous nodules, with peripheral expansion, central necrosis,with undermined borders. It was also reported earlier to be a cause of infection in patients with renal and bone marrow transplants . Mycobacterium haemophilum infection predominantly affects the skin , causing multiple cutaneous ulcerating lesions on the extremities, usually over the joints. The epidemiology of the organism is not well understood. The organism has also been isolated from bone, sputum, and synovial fluid.
Culture requires haemin for growth of the organism.