The common name for tinea cruris, medically known as ringworm, is due to a fungal infection that is often transmitted from tinea pedis and is somewhat contagious. You should usually disinfect contaminated clothing and towels, avoid excessive application of alkaline detergents for washing, and actively treat ringworm of the feet. Topical antifungal creams or ointments such as naftifine ketoconazole cream, sertaconazole cream, terbinafine cream, boutinafine cream, bifenazole cream, miconazole nitrate cream, etc. can be used topically and usually need to be adhered to for 1-2 months. When itching is obvious, glucocorticoid preparations can be applied for a short period of time, usually no more than two weeks. If the skin is dry and flaky, it is necessary to apply moisturizing agents together. If topical medication is not effective, oral antifungal drugs such as itraconazole capsules can be chosen.