Tinea corporis is a superficial skin disease caused by fungal infections, such as Trichophyton mentagrophytes, Trichophyton spp. and Trichophyton verrucosum. It occurs mostly in people with lowered immunity, such as those with diabetes and immune deficiencies such as tumors and AIDS, and is also related to long-term sweating and exercise. Because it is a fungal infection, it can be spread by direct or indirect contact, for example, people who have small animals at home or people who have gray nails and foot odor can spread indirectly. If the diagnosis is clear, you can apply topical terbinafine hydrochloride, ketoconazole or itraconazole for antifungal treatment.