Gray nails, i.e., onychomycosis, onychomycosis on the feet can be transmitted to the hands, need to consult the doctor in time, active treatment. Ringworm of the nails refers to the nail lesions caused by dermatophytes violating the nail plate and under the nail, the main causative organisms are Trichophyton rubrum, Trichophyton mustelii, etc., mostly spread through contact. As a result, tinea pedis can be transmitted to the hands and fingernails and needs to be treated in time. The treatment of onychomycosis is based on topical and oral antifungal drugs, commonly used drugs include amorolfine, cyclopiazepine, terbinafine, fluconazole, itraconazole, etc., all of which should be used under the guidance of medical professionals. It should be noted that the drug is not easy to enter the nail plate and the nail growth is slow, the treatment is more difficult, you need to adhere to the doctor’s prescription for a long time to use the drug.