Illustrations copyright 2001 by Nucleus Communications, Inc. All rights reserved. http://www.nucleusinc.com

An allergic reaction to medicine can cause hives. They appear as raised, red, itchy bumps (wheals) of different shapes and sizes, with defined red margins and pale centers. Hives may appear and then disappear at random and seem to move from place to place on the skin.

Illustrations copyright 2001 by Nucleus Communications, Inc. All rights reserved. http://www.nucleusinc.com

An allergic reaction to medicine can cause a rash that looks like measles. See the illustration above for the areas most commonly affected by the rash.