Blunt trauma, blunt injury, non-penetrating trauma or blunt force trauma refers to physical trauma to a body part, either by impact, injury or physical attack. The latter is usually referred to as blunt force trauma. The term refers to the initial trauma, from which develops more specific types such as contusions, abrasions, lacerations, and/or bone fractures. Blunt trauma is contrasted with penetrating trauma, in which an object such as a bullet enters the body.