What describes bruising or discoloration over the mastoid process located behind the ear?

Bruising or discoloration over the mastoid process, which is situated behind the ear, is specifically known as Battle's sign. This indicator is associated with a fracture of the temporal bone and suggests potential injury to the skull base. In the context of traumatic brain injury, the appearance of Battle's sign can provide valuable clinical information, as it often develops some time after the initial injury, reflecting internal bleeding that may suggest significant trauma.

While contusions refer generally to bruising from any impact and hematomas indicate blood accumulation due to vessel rupture, Battle's sign is more specific as it relates to skull fractures and the pattern of bruising in that distinct area. Concussion signs may encompass various symptoms including confusion, dizziness, and loss of consciousness but do not specifically denote the external bruising characteristic of Battle's sign. Thus, this term is reserved for the specific bruising behind the ear associated with serious head trauma.