A prong protrudes from the middle of the patient’s head, and the common clinical causes are mainly the following: First, a local protrusion can be formed by congenital abnormal development at the top of the head, at this time, if the local protrusion does not cause headache, numbness, swelling and other symptoms, and does not affect normal life, special treatment may not be required at this time, and close observation can be done. Second, if the head trauma, local tissue in the process of repairing the formation of a prism, it is recommended to improve the head MRI, CT examination as soon as possible, to clarify whether the local with hematoma formation and intracranial bleeding. For those with hematoma formation, timely surgical treatment is needed to remove the local hematoma to avoid serious complications, which may endanger life.