Tinea cruris is a disease caused by fungal infection, which can be completely eradicated. Some cases where long-term treatment is ineffective or fails to eradicate the disease are related to individual treatment plans. It is important to persist with treatment over a long period. When applying antifungal cream, the area covered must be large and the application must be prolonged, lasting at least one to two months. Only then can deep-seated fungi be completely killed, achieving eradication. After the disease is cured, it is also necessary to prevent its recurrence and cross-infection. Avoid using public baths and swimming pools, do not share washcloths and towels, do not keep small animals at home, try to maintain good hygiene, and disinfect underwear by exposing it to sunlight.