Slide show: Poison ivy and other summer skin irritants
Photo of tinea versicolor
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Tinea versicolor is a common fungal infection that results in small patches of discolored skin. Tinea versicolor is most common in warm, humid weather. The patches — which are often white or tan and may be itchy — grow slowly and may be more noticeable after sun exposure. The patches usually develop on the back, chest or upper arms and can cause mild itching.

Tinea versicolor can be treated with over-the-counter antifungal creams, lotions or shampoos. Skin color may remain uneven for several weeks, however, and the infection may return — especially in warm, humid weather.

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