The “big bag” that appears after a bump on the head may be bruising, or soft tissue edema, etc. Serious hematoma requires prompt medical attention. After the scalp bump, bump local swelling, the cause of trauma may be caused by subcutaneous soft tissue edema. At the same time, the scalp is rich in blood vessels, which can lead to bleeding of blood vessels in the tissues after the injury, forming various hematomas. Bleeding from the scalp often occurs in the subcutaneous tissues, under the capitellum, etc., forming a subcutaneous hematoma, subcapitellar hematoma or subperiosteal hematoma. Subcutaneous hematoma does not require special treatment, and can be self-absorbed after a few days. Capitellar subtenon hematoma and subperiosteal hematoma can be cold compresses and pressure bandages in the early stage, and small hematomas can be self-absorbed. Children with huge scalp hematoma, anemia and shock manifestations, blood transfusion should be timely. Children’s huge scalp hematoma and other more serious hematoma of the scalp, it is recommended to go to the hospital in a timely manner, under the guidance of a professional physician standardized diagnosis and treatment, so as not to delay the condition.