Redness and swelling around the nails may be related to trauma, onychomycosis, purulent dactylitis and other diseases. 1. Trauma: If the nails are subjected to external impact or pressure around the nails, it will lead to trauma to the nails, and redness and swelling around the nails may appear. 2. Onychomycosis: the cause of the disease is mainly related to infection by disease-causing microorganisms. Excessive nail trimming and long-term contact with irritants can also induce the disease. The patient’s fingernails (toes) will be localized redness, swelling, pain and other symptoms, the skin around the nail may also be separated from the nail plate. 3. Purulent dactylitis: the cause of the disease may be related to trauma, infection and other factors. Patients may experience swelling and redness around the nail. If the phenomenon of redness and swelling around the nails occurs, it is recommended to go to the regular hospital for examination to clarify the cause.