The first thing you need to do is to take your child to the hospital for examination and symptomatic treatment. After a child’s head is knocked out of the bag, the surface looks like a scalp swelling situation, but there is also the possibility of intracranial hemorrhage, which is usually called brain hemorrhage, once the intracranial hemorrhage will seriously endanger the child’s life safety. 2, the child’s head knocked a bag, if the hospital examination to exclude brain bleeding and other serious cases, can be based on the size of the knocked out package for symptomatic treatment, you can first cold compress, then hot compress, to promote the absorption of hematoma, if the absorption is slow, can be punctured drainage.