Onychomycosis, commonly known as nail fungus, is a nail damage caused by fungal infections of the nail bed. This disease is highly contagious and recurrent; it can be transmitted through contact, such as sharing slippers, foot towels, or socks. The most commonly used treatment is oral antifungal medication. However, if liver function is abnormal and transaminase levels are high, it is advisable not to use oral medications. Topical medications can also be effective, but they require a longer time to work. Otherwise, it is difficult to completely cure the condition in the long term. After recovery, avoid sharing slippers, avoid public baths and swimming pools, and minimize contact with others to prevent cross-infection.