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Jock itch, also called tinea cruris, is a common skin infection that is caused by a type of fungus called tinea. The fungus thrives in warm, moist areas of the body and as a result, infection can affect the genitals, inner thighs and buttocks. Infections occur more frequently in the summer or in warm, wet climates.
Jock itch appears as a red, itchy rash that is often ring-shaped. Read more about fungal infections of the skin.