Clinically, if the head is extracranial scalp hematoma, the fastest way to reduce the swelling is to give the patient a local cold compress to promote skin vasoconstriction, reduce edema, and also play a role in pain relief, which can be applied several times a day, usually for no more than half an hour each time, preferably with an ice water mixture, and the temperature should not be too low to avoid frostbite. If the patient exceeds 24-48 hours or more, it can be changed to hot compresses, which can accelerate the absorption of edema because the bleeding of the patient’s hematoma has stopped at this time. Clinically, if the patient’s edema is particularly large and continues to increase under cold compresses, consider a ruptured blood vessel and use hemostatic drugs and, if necessary, a needle to aspirate the hematoma.