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Bruises Overview. A bruise is a common skin discoloration that results from the breakage of tiny blood vessels leaking under the skin after a traumatic injury. Blood from damaged blood vessels beneath the skin collects near the surface of the skin to appear as what we recognize as a black and blue mark.This mark is from skin discoloration by red blood cells and their contents. A bruise is also known as a contusion.lood from damaged blood vessels beneath the skin collects near the surface of the skin to appear as what we recognize as a black and blue mark. This mark is from skin discoloration by red blood cells and their contents. A bruise is also known as a contusion.
Contusions are common types of bruises that are caused by trauma, often blunt-force injury, that damages and breaks open the tiny blood vessels in the tissues of the skin, mucus membranes or other organs. Contusions are often accompanied by pain and swelling due to the bodyâs inflammatory response to injury.urpura. Purpura is caused by spontaneous leaking of blood from tiny blood vessels (capillaries). It is a type of bruising that causes purple or red flat spots or patches on the skin and mucus membranes. Purpura that results in tiny spots on the skin is called petechiae.