Hives are classified as acute or chronic depending on whether they've been present for less than or greater than six weeks. This is a picture of a case of acute hives. Chronic hives often don't look like hives. They tend to look more like red places someone has scratched.
Acute Hives
From Heather Brannon, MD, former About.com Guide
Updated July 20, 2009
About.com Health's Disease and Condition content is reviewed by the Medical Review Board
Photo © A.D.A.M.
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