Chronic onychomycosis type gray nails, medically known as onychomycosis, can be treated with topical iodine povidone, combined with the use of antifungal ointment such as mupirocin and bifonazole, terbinafine, etc., together with the oral antifungal medication (terbinafine, itraconazole), and the removal of diseased nails if necessary, in order to achieve the purpose of treating onychomycosis. 1. Chronic onychomycosis is mostly due to the inflammatory changes in the nail groove caused by extrusion trauma or inattention to skin cleaning, which will affect the nail bed and cause onychomycosis. Patients can apply iodophor externally, use mupirocin and antifungal ointment such as bifonazole and terbinafine in combination with oral antifungal drugs such as terbinafine and itraconazole for treatment. During the medication period, make sure the nail area is clean and the shoes are loose and suitable. 2. If the effect of drug treatment is not good, or the patient’s inguinitis swelling is obvious, it is recommended to go to the hospital in a timely manner by a professional surgeon to deal with, if necessary, through the extraction of nails to remove the lesion of the fingernail or toenail, the operation should pay attention to the prevention of infection. It is recommended that patients pay attention to personal hygiene, increase the body’s immunity, follow the doctor’s instructions standardized treatment, do not blindly use their own medication.