Gray nails, i.e., onychomycosis, should be treated with medication or physical therapy according to the severity of the disease. 1. Medication: If nail fungus occurs, it can be treated with medication such as 5% amorolfine application and 8% cyclopiazepoxide nail coating under the guidance of a doctor. At the same time, you can also take oral terbinafine, itraconazole and other drugs to avoid aggravation of symptoms. 2. Physical therapy: If the effect of drug treatment is not good after a period of time, in order to alleviate the lesions of nails, you can promptly consult a doctor for physical therapy such as Nd-YAG laser, fractional laser and other treatments, which can help to kill the fungus and promote the penetration of drugs. After the appearance of nail fungus need to actively seek medical treatment, follow the doctor’s instructions for examination and treatment, so as not to lead to a variety of complications, such as nail breakage, shedding and so on.