What is a quick detumescence method for hitting a big bag on the forehead?

The forehead hits a big bag, it is recommended to go to the hospital to do a brain CT examination, rule out whether there is intracranial hemorrhage and skull fracture and other diseases. If it is only a simple scalp hematoma, then ice can be given cold compress, with the effect of swelling and pain, to be 24 hours later to give hot compress, promote the mass regression.