For a mild case of tenia cruris, your doctor may suggest first using an over-the-counter antifungal ointment, lotion, powder or spray. The rash may clear up quickly with these treatments, but continue applying the medication twice a day for at least 10 days.Reduce your risk of tenia cruris by taking these steps: Stay dry. Keep your groin area dry. Dry your genital area and inner thighs thoroughly with a clean towel after showering or exercising. Use powder around your groin area to prevent excess moisture. Wear clean clothes. Change your underwear at least once a day or more often if you sweat a lot. Wash workout clothes after each use. Be cool. Don't wear thick clothing for long periods of time in warm, humid weather. Find the correct fit. Make sure your clothes fit correctly, especially underwear, athletic supporters and sports uniforms. Avoid tightfitting clothes, which can rub and chafe your skin and make you more susceptible to cruris. Try wearing boxer shorts rather than briefs. Don't share personal items. Don't let others use your clothing, towels or other personal items. Refrain from borrowing these items from others as well...Consult dermatologist