The head is bumped, often swelling up a large bag, you can carry out the following treatment: 1, if the bump within 24 hours can be cold compresses, the use of ice, outside wrapped towel, on the injured part, can promote local capillary constriction, reduce exudation, reduce swelling and pain. 2, if the injury is 24 hours later, you can carry out hot compresses, to promote local blood circulation, accelerate the subcutaneous hematoma and absorption of tissue exudate. If the swollen bag is very large, it may be a relatively large subcutaneous hematoma formation, which requires timely examination and treatment at the hospital, and cannot be disposed of blindly on its own, otherwise it is likely to aggravate the condition.