What is mastoid ecchymosis?

Mastoid ecchymosis, also known as Battle's sign, is a medical term referring to bruising that occurs behind the ear, typically indicating a fracture of the skull, particularly the temporal bone. This sign can suggest underlying trauma to the head, often associated with serious conditions such as skull base fractures or brain injury. It may appear several hours to days after the initial injury. Prompt medical evaluation is crucial for proper diagnosis and management.