The ringworm at the base of the thigh is considered to be tinea cruris, which can be treated with general treatment and medication under the guidance of a doctor. 1. General treatment: ringworm patients should keep the local clean, avoid scratching and tearing the skin, so as not to aggravate the condition. At the same time, they should try to wear breathable and loose clothing, and the changed clothes should be washed and sterilized in time. 2. Drug treatment: patients can use antifungal drugs, such as clotrimazole, Butenafine, Amorolfine, etc., with antibacterial and bactericidal effect. You can also take oral itraconazole, terbinafine and other antifungal drugs for joint treatment to increase the efficacy. For patients suffering from ringworm, it is recommended to go to a regular hospital for consultation and treatment under the guidance of a doctor.