Gray nail in the clinical refers to nail fungus, commonly used drugs such as topical drugs such as amorolfine nail coating, systemic drugs such as itraconazole. 1. external drug treatment: white superficial type and distal lateral subnail type damage often external drugs, such as external 3% ~ 5% tincture of iodine or 30% glacial acetic acid solution, until the new nail grows out. Disease nail softening stripping can also be used 40% urea ointment sealing, and then topical 8% cyclopiazepine, 5% amorphophallus nail coating and other antifungal drugs. 2. Systemic drug therapy: such as itraconazole intermittent shock therapy or terbinafine continuous taking, if with the combination of topical drugs can improve the efficacy. It should be noted that the key to the treatment of onychomycosis is to adhere to the medication, because the drug is not easy to enter the nail plate and nail growth is slow, the treatment is more difficult. If diagnosed with onychomycosis, you need to go to the hospital in time, under the guidance of the doctor standardized treatment, the use of drugs need to follow the doctor’s instructions, do not blindly deal with, so as not to cause adverse consequences.