Nail fungus is an infection that occurs anywhere in the nail groove. The area where the nail meets the skin forms a groove called a nail groove. It is often caused by secondary infections such as skin plucking, puncture wounds, nail root fractures or injuries during nail trimming. Common manifestations: Initially, some skin folds become red, swollen and painful, and then gradually spread to the entire nail groove, sometimes forming a subepidermal abscess, and sometimes invading the underside of the nail to form a nail abscess. Prevention: Educate and train children in good hygiene habits and proper hygiene, such as washing hands regularly, not sucking fingers, trimming nails regularly and not too short, applying oil in winter to prevent dry skin, avoiding skin damage, etc. When the barbed skin is raised, the barbed skin should be cut out in time. Treatment: Nail fungus can heal on its own, or it can rapidly become septic. In the early stage, non-surgical treatments can be used, such as hot water soaking for half an hour 5-6 times a day; or washing the hands and applying antibiotic ointment and gauze wrapping. When nail infection forms an abscess a surgical incision should be made to drain it.