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Lifespan’s A - Z Health Information Library |
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Swimming pool granulomaDefinitionA swimming pool granuloma is a long-term (chronic) skin infection caused by the bacteria Mycobacterium marinum. Alternative NamesAquarium granuloma; Fish tank granuloma CausesA swimming pool granuloma occurs when water containing Mycobacterium marinum bacteria enters a break in the skin. A skin infection occurs about 3 weeks later. Risks include exposure to swimming pools, salt water aquariums, or ocean fish. SymptomsThe main symptom is reddish bumps (papules) that slowly grow into purplish nodules. The elbows, fingers, and back of the hands are the most common body parts affected. The knees and legs are less commonly affected. The nodules may break down and leave an open sore. Or they may spread up the limb. Exams and TestsTests to diagnose swimming pool granuloma include:
TreatmentAntibiotics are used to treat this infection. They are chosen based on the results of the culture and skin biopsy. You may need several months of treatment with a combination of antibiotics. Surgery may also be needed. Outlook (Prognosis)Swimming pool granulomas can usually be treated completely with antibiotics. Possible ComplicationsOccasionally, joint or bone infections occur. The disease may be longer or more complicated in patients whose immune system is not working properly. When to Contact a Medical ProfessionalCall your health care provider if you develop reddish bumps on your skin which do not clear with home treatment. PreventionAvoid contact with contaminated water. Wear gloves or wash thoroughly when cleaning aquariums. ReferencesHolland S. The nontuberculous mycobacteria. In: Goldman L, Ausiello D, eds. Cecil Medicine. 23rd ed. Philadelphia, Pa: Saunders Elsevier; 2007:chap 346. Review Date: 3/17/2009
Reviewed By: David C. Dugdale, III, MD, Professor of Medicine, Division of General Medicine, Department of Medicine, University of Washington School of Medicine; and Jatin M. Vyas, MD, PhD, Assistant Professor in Medicine, Harvard Medical School, Assistant in Medicine, Division of Infectious Disease, Department of Medicine, Massachusetts General Hospital. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc. The information provided herein should not be used during any
medical emergency or for the diagnosis or treatment of any medical
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