no blood vessels or nerve cells. ??? ??? ??? erythema is a reddish color of the skin that can be caused by either burns or a congestion of blood in vessels ??? ??? ??? integumentary system or skin, has been called both a membrane, because it covers the body, and an organ because it contains several kinds of tissues. ??? ??? ??? jaundice a yellow discoloration of the skin, can indicate bile in the