Slapped in the face, within 24 hours after the injury requires cold compresses, cold compresses can make the injured part of the ruptured small blood vessels contraction, to relieve the swollen parts continue to bleed. Cold compress is wrapped in ice inside a towel and put the towel on the face, not directly on the face, easy to frostbite the skin, and at the same time to reduce activities more rest. When the cold compress after 24 hours, the bleeding of the face has basically stopped, you need to change the cold compress to hot compress, hot compress can promote the dissipation of the bruises on the face, the head and face blood supply is richer, the swelling after the injury fades faster.