A healed wound, ulcer or breach of tissue. A scar consists essentially of fibrous tissue, covered by an imperfect formation of epidermis in the case of scars on the surface of the skin. The fibrous tissue is produced by the connective tissue that migrates to the wound in the course of its repair (see WOUNDS). Gradually this fibrous tissue contracts, becomes denser, and loses its blood vessels, leaving a hard white scar. (See also KELOID.)