Gray nails, also known as onychomycosis, can be treated with oral medications and topical medications as prescribed by the doctor. Onychomycosis is a nail lesion caused by dermatophytes invading the nail plate and subnail tissues. Mainly have nail discoloration, loss and surface unevenness and other manifestations. Onychomycosis is a nail infection caused by yeast, dermatophytes and other fungi. Serious patients can follow the doctor’s prescription oral antifungal drug treatment, such as terbinafine, itraconazole and so on, can play the role of antibacterial and bactericidal. Oral medication can also be prescribed topical antifungal medication, such as 8% cyclopiazepine, 5% amorolfine, etc., which can quickly penetrate into the nail bed, thus playing an antibacterial and antiseptic role. In addition to medication, patients can also choose to treat onychomycosis with treatments such as nail debridement. When patients suffer from onychomycosis, it is recommended to go to regular hospitals in time to receive treatment, and take oral medication under the guidance of professional doctors, avoid self-medication.