Jock itch: A common fungal infection sometimes referred to as ringworm, involving the skin of the inner thighs, buttocks, and genitals. Also known as tinea cruris. It occurs most frequently in people who are overweight and/or who sweat profusely, such as athletes. Symptoms include an itchy, red, sometimes ring-shaped rash. Treatment involves topical or oral antifungal medications.
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