Tinea cruris is a disease caused by fungal infection, usually growing on the inner thigh or buttocks. The fungus is sensitive to some spicy and stimulating foods, such as chili peppers, lamb, seafood, etc. Thus, it is essential not to eat these foods. Traditional Chinese medicine believes that this disease is caused by damp-heat pouring downwards, so foods that cause internal damp-heat should also be avoided, especially those with strong flavors or too sweet. During treatment, dietary and lifestyle habits should be regulated; avoid public baths, swimming, and keeping small animals at home. If there are patients with athlete's foot, socks and underwear must be washed separately and disinfected by sun exposure. This disease is highly infectious and recurrent, so it is vital to be cautious at all times.