Treatment of nail fungus with dacrynic acid is ineffective. Dacrynic acid is an antifungal drug and is ineffective in the treatment of Staphylococcus aureus infection. Nail fungus is mainly an infectious disease caused by tiny punctures, contusions, or trimming the nail too deeply when the nail is damaged next to the nail groove tissue, secondary to bacterial infection. The causative organism is usually Staphylococcus aureus. Treatment is as follows: 1. When no redness or abscess is formed, it is usually treated with antibiotics, such as cephalosporin antibiotics or penicillin antibiotics; topical Bactrim ointment is used. 2. When an abscess is formed, it can manifest as local redness, swelling, heat, pain, and even purulent secretions. When an abscess forms and causes separation of the nail bed or recurrent nail infections, fibrous scarring can form and usually requires treatment with nail extraction.3. Nail reconstruction