Grey nail is medically known as nail fungus, a superficial fungal nail disease. If only a single nail is damaged, topical antifungal preparations can be applied topically, and oral medication is not needed for the time being. Clotrimazole solution, compound tincture of hibiscus skin, terbinafine coating, etc. can be applied topically 2-3 times a day for 3 months until the new nail grows back. If more nails are involved, at this time the topical medication can no longer be controlled, it is recommended to take oral antifungal medication under the guidance of a dermatologist, generally choose itraconazole or terbinafine.