Considered from two aspects, the first is caused by external impact, you need to immediately disinfect the injured area, you can use iodophor, and then wrapped with medical gauze, oral antibiotics for anti-inflammatory treatment. During this period, we should pay attention to the regular change of disinfection, but also pay attention to not let the affected area contact with water, to avoid secondary injuries occur. Secondly, it is caused by nail diseases, such as gray nails, etc., and requires medication, such as using compound povidone-iodine application and miconazole nitrate cream for antibacterial treatment. At the same time, we should pay attention to protect the exposed nail bed, can be smeared with malt oil finger massage, to promote the growth of new nails.