A drop of a solution containing a possible allergen is placed on the skin. Then a series of scratches or needle pricks lets the solution enter the skin. If the skin gets a red, raised itchy area (called a wheal), it usually means that the person is allergic to that allergen.
ByHealthwise Staff Primary Medical ReviewerE. Gregory Thompson, MD - Internal Medicine Specialist Medical ReviewerRohit K Katial, MD - Allergy and Immunology
Current as ofMarch 12, 2014
WebMD Medical Reference from Healthwise
March 12, 2014
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