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Primary Lesions - Wheal

From Heather Brannon, MD, About.com

Updated: August 27, 2006

About.com Health's Disease and Condition content is reviewed by Casey Gallagher, MD

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CDC/ Dr. William Foege
A wheal on the arm
A wheal is a firm, spongy lesion formed when the dermis is filled with fluid. A wheal will typically last for a very short time - up to hours - then disappear.
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