Swimming pool granuloma

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A swimming pool granuloma is a chronic skin infection caused by the bacteria Mycobacterium marinum.

Aquarium granuloma

A swimming pool granuloma results when water containing an infectious organism, Mycobacterium marinum, enters a break in the skin. A localized infection called a granuloma results after about 3 weeks. The lesions appear as reddish bumps (papules) that slowly enlarge into purplish nodules. The elbows, fingers, back of the hands, and knees are the most common sites affected. The nodules may break down and leave an open sore, or spread up the limb.

Review Date: 04/30/2005
Reviewed By: Jonathan Kantor, M.D., Department of Dermatology, University of Pennsylvania Medical Center, Philadelphia, PA. Review provided by VeriMed Healthcare Network.