Ringworm i.e. fungal infections, most commonly tinea pedis, ringworm of the hands, ringworm of the body, ringworm of the femur, ringworm of the nails (grey nails), etc., except for nail fungus, simple topical creams are sufficient. All skin-related ringworm are superficial fungal infections, and topical application of ketoconazole cream, bifidazole ointment, etc., once a day is sufficient. Because fungal spores are highly viable and easily recurring, the treatment course is appropriately extended, usually for 2 weeks after the symptoms disappear. For ringworm with significant erosion or keratinization, a wet compress of 3% boric acid solution can be used to help with astringency or a retinoic acid ointment to help soften the keratin. For onychomycosis, it is difficult for topical medications to penetrate because of the hard texture of the nail. In addition to trimming the diseased nail as much as possible, oral antifungal medications are the preferred treatment. Oral terbinafine (continuous therapy) or itraconazole capsules (shock therapy) are recommended. Oral antifungal drugs all have some hepatotoxicity and need to be used under the guidance of a physician with strict liver function testing. Of these, shock therapy uses less total medication and has fewer costs and side effects, and is more recommended. In addition to onychomycosis, other dermatophytoses, such as tinea cruris, can be combined with oral antifungal medications when topical application alone is not effective (usually 4-8 weeks is sufficient). Patients with ringworm should pay attention to living in isolation, not sharing shoes, socks, bath tubs, towels, etc., and to disinfecting and sterilizing with more scalding and boiling.