Generally speaking, different treatment methods can be used according to the specific situation of the back of the head: a. If the patient has a subcutaneous hematoma caused by trauma to the back of the head, which is often accompanied by obvious pain symptoms, it is recommended that the patient should be given local ice as soon as possible to promote capillary constriction and avoid progressive increase of the hematoma. If the hematoma is accompanied by local skin infection, it is necessary to perform debridement and drainage of the hematoma to avoid aggravation of infection causing serious intracranial infection. If the patient has a small mass at the back of the head caused by the accumulation of subcutaneous fatty tissue, if there is no obvious pain symptoms, it can be closely observed and does not require special treatment.