Mycobacterium marinum is a slow-growing atypical mycobacterium. It is a photochromogen; when exposed to light, it produces yellow pigment. In humans, it manifests as a localized granuloma or sporotrichotic lymphangitis. Patients at risk include anglers (commercial, recreational), oyster workers, swimmers, aquarium workers, and individuals with aquariums in their homes. Herein, we report a case of a Mycobacterium marinum infection which was misdiagnosed because there was no histopathological evidence of acid-fast bacilli and the slow growth rate in cultures.
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