The phenomenon of gray nails at the age of 16, usually referred to as onychomycosis, is caused by dermatophytes invading the nail bed of the nail plate, and can be relieved with topical medications, oral medications, and other treatments. 1. topical drugs: because this is a fungal infection, so with the doctor with topical ketoconazole, econazole, clotrimazole and other antifungal drug treatment, so as to improve the patient’s symptoms. 2. Oral medication: mainly for patients with poor effect of topical application, oral terbinafine, itraconazole, fluconazole and other antifungal drugs can be added to increase the therapeutic effect. 3. Other treatments: some types of onychomycosis, such as distal nail plate involvement, ingrown nails, etc., also need to cooperate with the doctor to carry out nail extraction or nail removal surgery treatment to improve the patient’s symptoms. If you are 16 years old and have nail fungus, it is recommended that you go to the hospital, cooperate with the doctor for examination, and follow the doctor’s instructions to give standardized treatment after diagnosis, do not self-medication.