A large bump on the head, usually a subcutaneous hematoma, first requires a hospital visit to check the cranial CT to see if there is a combined skull fracture and intracranial hemorrhage. If the patient has no obvious clinical symptoms, no depressed or comminuted fractures on the head CT, and no intracranial hemorrhage, the subcutaneous hematoma will generally gradually subside within 2 weeks as long as rest is paid attention to and cold compresses are applied to the hematoma for the first 24 hours and then changed to hot compresses after 24 hours. If the subcutaneous hematoma does not subside significantly or even becomes mechanized and calcified, local anesthetic surgery, such as hematoma puncture with pressure dressing and blood clot removal, is required. If the patient has obvious clinical symptoms, a cranial CT shows an obvious depressed fracture or comminuted fracture, or there is intracranial hemorrhage, he needs to be kept in the hospital or even hospitalized for infusion therapy. If the bleeding volume is large, greater than 30 ml above the curtain, greater than 10 ml below the curtain or 1 cm midline shift, and progressive decline in consciousness, emergency surgery is required to rectify the depressed fracture fragment, remove the comminuted fracture fragment, remove the intracranial hematoma, etc. The subcutaneous hematoma is treated as before.