Head banging bag is due to soft tissue injury caused by capillary rupture, bleeding and formation, you can use cold towels, or medical ice bags for local cold compresses in the early 24 hours of injury, so that the injured part of the capillary constriction, reduce the formation of hematoma, pay attention not to the ice directly touch the skin to prevent frostbite. Only after 24 hours can hot compress, hot compress can make the subcutaneous hematoma accelerate absorption, must pay attention to is cold compress within 24 hours, hot compress after 24 hours. Pay attention to observe whether dizziness occurs after the collision, if it is more serious and the symptoms of vomiting appear, you should immediately go to the hospital to prevent irreversible situations from occurring. Don’t rub your hands after your head starts to avoid causing the lump to become bigger, and pay attention to a diet based on easily digestible food and avoid spicy stimulation.