Swimming pool granuloma is a chronic skin infection caused by the bacteria Mycobacterium marinum. The infection is acquired when water containing the bacteria makes contact with a break in the skin. The most common infection sites are the hands, knees and elbows, those sites that most often have breaks in the skin. After about three weeks. The lesions appear as reddish bumps that slowly grow, becoming purplish nodules.

The nodules may break down and ulcerate, leaving open sores or spread up the limb. As well as this, it is important to treat this conditon, as possible complications include more serious skin and bone infections. Identification usually takes place after a biopsy, and the infection can be treated with an antibiotic, such as minocycline. Due to the persistent nature of the infection months of treatment may be required.

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