Tinea cruris is a disease caused by fungal infection. Without treatment with ointments, it generally cannot heal by itself, meaning that it requires treatment to be cured. Once the fungus adheres to the skin surface, it will reproduce more and more, and the affected area will gradually expand, potentially infecting the entire body. Therefore, once detected, it is essential to use medication properly. Commonly used antifungal creams can completely cure it. If the affected area is relatively large, it may also be appropriate to choose oral antifungal medications. During the treatment period, it is important to maintain proper dietary and living habits. It is advisable not to keep small pets at home, and for patients with athlete's foot, socks and underwear should be washed separately and frequently exposed to sunlight for disinfection.