granuloma, fishbowl

granuloma, fishbowl Localized nodular skin inflammation (small, reddish, raised areas of skin) that is caused by the bacterium Mycobacterium marinum (M. marinum). Fishbowl granuloma is typically acquired by occupational or recreational exposure to salt or fresh water; often it is the result of scratches or scrapes of the skin during the care of aquariums. The diagnosis is confirmed through a culture of tissue specimens that yield M. marinum. The infection can be treated with a variety of antibiotics. Also known as swimming pool granuloma.