Mycobacterium marinum skin infections: two case reports.

Most infections of soft tissue injury sites are caused by Staphylococcus or Streptococcus and respond to beta-lactam antibiotics. Occasionally, a patient does not respond to routine antibiotics, and other possibilities must be considered. A detailed history of the event that caused the soft tissue injury can be important in the diagnosis. Two cases of Mycobacterium marinum soft tissue infection (ie, fish tank granuloma) are presented.