Tinea corporis is a fungal infection that causes erythema, papules, and even blisters on the skin, followed by gradual desquamation, often in a ring-like pattern. These lesions are scattered separately at the beginning of the disease, but as the disease progresses, they can fuse and overlap with each other, and sometimes even spread all over the body, especially in patients with immunodeficiency diseases or those who use immunosuppressive drugs, glucocorticoids, or antineoplastic drugs. Due to the role of each individual’s defenses, the center of such ring-shaped lesions can gradually heal and desquamate on its own, with elevated, ring-like edges, or there may be some active erythema, papules, blisters, or desquamations. In principle, topical medication is the main treatment for ringworm, and topical creams such as clotrimazole cream, sertaconazole, terbinafine, and ketoconazole are common. If ringworm causes generalized ringworm, oral antifungal medications such as fluconazole, itraconazole, and terbinafine can be considered. The prerequisite for oral antifungal medication is normal liver function, and if oral medication is needed, it must be checked at a hospital and only administered orally under the guidance of a doctor. The main thing to prevent ringworm is to avoid contact with animals that have ringworm, such as cats and dogs. Ringworm can also be transmitted through bath tubs and towels used by patients with ringworm, so it is important to clean and disinfect public utensils on a regular basis, and to avoid the abuse of drugs that affect the body’s resistance, such as glucocorticoids and immunosuppressants.