A 27-year-old female asked:
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 • 5 doctors weighed in
Pediatric Allergy and Asthma 31 years experience
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.
Created for people with ongoing healthcare needs but benefits everyone.
3.9k viewsReviewed >2 years ago
Last updated Apr 9, 2016
Connect with a U.S. board-certified doctor by text or video anytime, anywhere.
24/7 visits - just $39!
50% off with $15/month membership
Content on HealthTap (including answers) should not be used for medical advice, diagnosis, or treatment, and interactions on HealthTap do not create a doctor-patient relationship. Never disregard or delay professional medical advice in person because of anything on HealthTap. Call your doctor or 911 if you think you may have a medical emergency.