Nail fungus is an infection of the nail and its surrounding tissues, often caused by minor trauma. It often occurs in the summer and is prone to recurrence. It often occurs on one side of the nail groove under the skin, with painful redness and swelling. If the symptoms worsen, the pain increases and there is a fluctuating sensation in the red and swollen area. Inflammation can spread and cause an abscess under the nail. If an abscess is not formed at the beginning of nail infection, you can use local ointment of ichthyolite, infrared physiotherapy, etc. and take oral antibacterial drugs, but if it has opened into an abscess, you should operate, and the operation is usually done under local anesthesia to cut and drain the pus. For abscesses at the nail root, a part of the nail or even the whole nail should be removed separately. Paying attention to nail hygiene and not cutting nails too short can help prevent the formation of nail infections.