Clinical Medicine Insights: Dermatology

Mycobacterium marinum belongs to the slow growth photochromogenous mycobacteria group. It is pathogenic for fish and human beings in which it can cause cutaneous nodular and ulcerative lesions, sometimes with sporotrichoid arrangement. We report three cases of sporotrichoid Mycobacterium marinum infections successfully treated with prolonged antibiotic therapy. Tropical fish aquaria and, more in general, the water environment were identified as the source of infection.