Onychomycosis is a type of nail damage that occurs after a fungal infection of the nail bed, commonly known as athlete's foot. Once infected, if untreated, the nail will gradually deteriorate and may even be contagious and recurrent. Soaking in white vinegar does not effectively treat the condition; while it may suppress the fungus to some degree, it cannot completely cure athlete's foot. Currently, the most effective treatment for this disease is oral antifungal medication. Oral antifungal medications require normal liver function; if liver function is abnormal and transaminase levels are high, oral medications should not be taken. It is recommended to use topical medications to treat athlete's foot. Although the effect is slower, complete recovery is possible with long-term persistence. During treatment, avoid wearing sandals carelessly, and stay away from public baths and swimming to prevent cross-infection. (Use of medication should be under the guidance of a doctor.)