Allergic Skin Reactions
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.
An allergic reaction to medicine can also cause a rash that looks like measles. See the picture above for the areas most commonly affected by the rash.
eMedicineHealth Medical Reference from Healthwise 
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