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A fungal infection is the source of his discomfort, causing an itchy red and scaly rash in the groin, inner thighs, or buttocks areas. Jock itch is closely related to athlete's foot and ringworm. Over-the-counter antifungals containing butenafine hydrochloride (Lotrimin) or terbinafine hydrochloride (Lamisil) should clear it up in a few days. Make sure he follows the directions on the package and applies the creams beyond the edge of the rash. If it doesn't clear up in a week, see a doctor. It may be a friction rash.

To keep jock itch away, he should dry himself well after showering and wear absorbent cotton underwear Also, since the fungus can be the same as one that causes athlete's foot, he should put on his socks before his underwear to avoid transferring spores from his feet to his groin.