Final answer:
Ecchymosis, subcutaneous hematoma, bruise, and bump are all considered to be types of contusions, which are injuries caused by blunt force trauma where the skin is not broken.
Step-by-step explanation:
Ecchymosis, subcutaneous hematoma, bruise, and bump are all types of external injuries that can be classified as a Contusion. A contusion is an injury that doesn't break the skin but results in blood vessels being severed beneath the surface, causing blood and blood components like erythrocytes and white blood cells to leak into the surrounding tissues. This type of injury is generally caused by a blunt force trauma, where the force of the impact is strong enough to damage the blood vessels but not to break the skin.