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A 34-year-old female asked:

My son has vitiligo skin pigmentation , he got a big white spot on his hest, and he is swimming alot, but now there is brown small spot in that area?

1 doctor answer2 doctors weighed in
Dr. Ralph Morgan Lewis
Family Medicine 38 years experience
Vitiligo? : Possibly not vitiligo but rather tinea versicolor, a chronic, low-grade fungal infection of the skin that presents as well-delineated patches that may have a fine scale; can be white or tan. Chlorine in pool water might temporarily resolve some of the fungus & allow the skin to tan. Fp can check diagnosis with skin scraping for fungus &/or black light (causes fungus to fluoresce yellow-green color.

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Last updated Nov 14, 2013

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