Hi & Welcome to HCM. You seem to be suffering from Jock itch or Tinea cruris. It is a fungal infection that affects the skin of your genitals and upper inner thighs. It is common in people who sweat a lot, as do athletes & in people who are overweight. You can use an over-the-counter anti-fungal ointment, lotion, powder or spray containing Terbinafine or Clotrimazole. Apply the medication twice a day on the affected areas for at least 10 days. If you also have athlete s foot (fungal infection), treat it at the same time. This will reduce the risk of recurrence. If jock itch is severe or doesn t respond to over-the-counter medicine, you may need prescription only antifungal pills like Fluconazole after visiting a GP. Also take the following preventive measures to reduce the risk of recurrent fungal infection or Tinea cruris like: 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. Change your underwear at least once a day or more often if you sweat a lot. Wear thin & loose cotton clothing undergarments in warm & humid weather. Avoid tight fitting clothes, which can rub and chafe your skin and make you more susceptible to jock itch. Don t let others use your clothing, towels or other personal items. Control any athlete s foot infection to prevent its spread to the groin. Regards.