A swimming pool granuloma occurs when water containing Mycobacterium marinum bacteria enters a break in the skin.

Tests to diagnose swimming pool granuloma include:

A swimming pool granuloma is a long-term (chronic) skin infection caused by the bacteria Mycobacterium marinum.

Aquarium granuloma (also known as "Fish tank granuloma," and "Swimming pool granuloma") is a skin condition caused by Mycobacterium marinum, characterized by a skin lesion that presents roughly three weeks after exposure.