A 33-year-old female asked:
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I've had bad allergies my whole life. Reacted to skin test with red itchy bumps however doctor said the test was negative. Why did I react?

1 doctor answer
Dr. Gary Steven
29 years experience in Pediatric Allergy and Asthma
Hard to say: There are conditions in which the skin does not react properly to a skin test. Thus, to rule that out, we always place what is called a "positive control" - one of the tests is not an allergen, but histamine, which is the chemical released in an allergic reaction. If you don't react to histamine, we know that something is wrong with your skin. So a negative panel always has ONE itchy bump.
Answered on Apr 9, 2016
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