Do u mean Urticaria? Urticaria is outbreak of hives, which is a type of allergic reaction, they're raised pink spots on skin made up of dilated blood vessels. They blanch when push on them, take pressure off, blood flows back. They're evanescent, may occur in any area of the body, itchy. Cause may something ate, inhaled, contacted, but often unknown cause. May take days to weeks/longer to stop. If>1month, see pcp.