Nail fungus is commonly known as “gray nail”, there is no authoritative information to prove that acetic acid can treat nail fungus. Nail fungus is due to dermatophytes invade the nail plate and subnail tissue caused by nail lesions, manifested as discoloration, thickening, turbidity, shedding, surface unevenness and other symptoms. The treatment of onychomycosis is based on medication, due to the special anatomical structure characteristics of the nail plate, resulting in difficult penetration of drugs, its treatment course is longer, and easy to relapse, common medications such as amorphophine, cyclopyrrolidine and other local drugs, terbinafine, itraconazole and other systemic drugs. Acetic acid, also known as acetic acid, has a local anti-bacterial and fungal effect, commonly used in the treatment of superficial infections of the external auditory canal, maintaining the normal acidity of the vagina, preventing the growth of sensitive bacteria in the bladder, etc., but at present there is no authoritative information to prove that acetic acid can be used to treat onychomycosis. It is recommended that patients with onychomycosis, timely medical treatment, standardized treatment under the guidance of the doctor, avoid private medication, so as not to delay the condition. The above drugs need to be used in accordance with medical advice.