Gray toenails are nail fungus, and nail fungus can be completely cured by general treatment, medication, nail extraction or nail removal surgery. Tinea cruris refers to the nail lesions caused by dermatophytes invading the nail plate and under the nail; commonly known as “gray nails”, it is a common disease in dermatology. 1. General treatment: usually pay attention to foot hygiene, often wash your feet, your shoes and socks should be changed every day, can be exposed to the sun, avoid sharing shoes and socks with others and scratching with hands. 2. Drug treatment: under the guidance of a physician, you can use topical amorphophallus application, or terbinafine tincture for local application, together with oral itraconazole, terbinafine and other antifungal drugs to combine treatment. 3. Nail extraction or nail removal surgery: it is suitable for those who are ineffective in drug treatment or have complicated nail conditions, such as some types of onychomycosis, such as distal nail plate involvement, macular streak nail, ingrown nail and nail plate thickness >2 mm, local removal of diseased nails is necessary; however, due to the large damage of surgical nail extraction, it is limited to the treatment of non-accompanied by tinea pedis and single onychomycosis. Need to go to the hospital, under the guidance of the physician to choose reasonable drugs and methods of treatment, you can not just use drugs.