Jock itch (tinea cruris) is a fungal infection that causes a red and itchy rash in warm and moist areas of the body. The rash often affects the groin and inner thighs and may be shaped like a ring.
Jock itch gets its name because it’s common in athletes. It’s also common in people who sweat a lot or who are overweight.
Although often uncomfortable and bothersome, jock itch usually isn’t serious. Treatment may involve keeping the groin area clean and dry and applying topical antifungal medications to the affected skin.