The back of the head knocked a bag, according to the specific circumstances of the mass, the clinic can often take different treatment methods: a. If the patient’s back of the head mass is a local skin soft tissue injury formed hematoma, at this time, you can avoid the progressive increase in the volume of the hematoma by local ice external application. Infrared physiotherapy and moxa fumigation can be given at a later stage to improve blood circulation around the hematoma and promote faster absorption of the hematoma-forming mass. If the larger hematoma cannot be completely absorbed, local hematoma removal is feasible when necessary to avoid serious complications caused by infection. Second, if the patient has a more serious bump on the back of the head, accompanied by skull fractures causing local masses. In this case, the patient needs to improve the head CT examination to clarify the severity of the fracture, whether there is intracranial hematoma and cerebral nerve contusion, and if there is any abnormality, promptly perform surgical treatment. Postoperative supportive treatment such as infection prevention, analgesia and edema reduction can achieve better treatment results.