After hitting your head, it is always necessary to treat with cold compresses. If hot compresses are applied, the ruptured small blood vessels will dilate, which will aggravate the bleeding condition and increase the edema of the surrounding tissues. Therefore, cold compresses are needed after a head injury to allow the end of the ruptured blood vessels to be constricted, reduce the exudation of tissue fluid, and reduce the condition of edema. And generally are always cold compresses, time about 3-4 days, mainly depends on the specific scalp hematoma situation. If the scalp hematoma is relatively small, cold compresses can be applied for 3-4 days. If the scalp hematoma is relatively large, even need to be treated through the way of pressure bandage, more effective to achieve the degree of hemostasis. Another point must be noted, if there is a certain sense of fluctuation after 3-4 days, it is necessary to puncture and suction under strict aseptic conditions, so as to solve the corresponding trend of change in the condition. And no matter whether it is a cold compress or a pressure bandage, it must be further carried out under the condition of clear intracranial condition.