black and blue

from the GNU version of the Collaborative International Dictionary of English.

• adjective discolored by or as if by bruising; -- of skin.
• noun the dark color of a bruise in the flesh, which is accompanied with a mixture of blue.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• adjective colloquial, idiomatic, of a person Having obvious bruises of the skin, typically from falling or being hit or punched.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• adjective discolored by coagulation of blood beneath the skin