Red colouring of the skin at an infected spot or in urticaria.
Reddening of the skin around a lesion produced by an allergic reaction.
Reddening of the skin that spreads outward from a focus of infection or irritation in the skin.
A flush or spreading area of redness that surrounds a line made by drawing a pointed instrument across the skin. It is the second reaction in the triple response of skin to injury and is due to dilatation of the arterioles.