Separation of the finger from the nail is usually nail separation, which may be caused by diseases (such as onychomycosis), medications (such as desiccated gentamicin), trauma and other factors. 1. Diseases: When the finger suffers from onychomycosis, onychomycosis, pyogenic granuloma and other diseases, it will lead to separation of the nail from the tissues, and the symptom of nail separation will appear; certain systemic diseases will also lead to the symptom, such as lowered thyroid function, hyperthyroidism and so on. 2. Drugs: the use of certain drugs will appear nail separation of adverse reactions, such as dexamethasone or tetracycline treatment occurs in sunlight nail separation. 3. Trauma: When trauma occurs to the finger, it can lead to separation of the nail from the subnail tissue, insufficient blood supply to the nail, and symptoms of nail separation. Infections, chemical agents and other factors may also lead to nail separation, and patients are advised to seek prompt medical treatment.