Subgaleal hemorrhage is a medical condition that causes bleeding in the space between the scalp and the skull. The condition can cause severe pain and discomfort in the affected area, and is typically caused by head trauma or injury. There are several synonyms for subgaleal hemorrhage, including scalp hematoma, subaponeurotic hemorrhage, and extracranial scalp hematoma. These terms describe the same condition, but may be used interchangeably by medical professionals depending on their preference and the severity of the condition. Regardless of the term used, subgaleal hemorrhage requires medical attention to prevent further injury or complications.