Swollen head knocked out of the bag, you can use cold compresses, hot compresses and other ways to achieve rapid reduction of swelling. 1. Cold compress: Cold compress should be applied immediately after the head is swollen. You can use ice or cool towel to place on the injured part, each cold compress should not last too long to avoid frostbite, 20~30 minutes is appropriate. Cold compresses should be applied intermittently within 48 hours of injury. 2. Hot compresses: 48 hours after the injury, you can carry out appropriate local hot compresses. Hot compresses can help improve local blood flow and promote the absorption of hematoma. Generally, mild swelling can be relieved by cold and hot compresses. If there are obvious symptoms such as headache, dizziness or even vomiting in combination with swelling of the head, we should consult the doctor as soon as possible and have a CT examination of the head to find out whether there is a combination of intracranial injury.