Gray nails, also known as nail fungal disease caused by fungal infection, can be cured by topical medication, systemic medication and other measures of treatment. 1. Topical medication: Since it is not easy for topical medication to enter the nail plate, you can use a knife or a nail file to remove the nail as much as possible, and then seal it with urea ointment to strip the nail and apply antifungal medication, such as cyclopirox ketamine ointment or amorphophallus nail polish. 2. Systemic medication: you can choose itraconazole capsules, terbinafine tablets, fluconazole capsules and other antifungal drug treatment. Drugs may cause drug liver injury, allergy to drugs is prohibited. Nail fungal disease should go to the hospital in time for examination, standardized treatment under the guidance of the doctor, all drugs need to be used under the guidance of a professional doctor, to avoid their own abuse of drugs.