The child fell to the forehead a bag, mild can be 72 hours cold compress, 72 hours after the hot compress and so on to relieve. For serious cases parents can take the child to the hospital for examination and treatment. When the wound is mild, you can gently apply cold compresses locally with cold towels to reduce congestion and avoid further aggravation of inflammation and tissue edema. After 72 hours, the local inflammation and edema can be controlled by applying hot towel or cooked egg to promote local blood circulation and improve metabolism level, so as to achieve the effect of reducing swelling. If the child has poor mental reaction and vomiting after knocking out a big bag, it will cause intracranial hemorrhage. In this case, parents should immediately take the child to the hospital for examination and effective treatment.