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A member asked:
How long for an allergic reaction to start after you apply substance?
A doctor has provided 1 answer
Skin allergies: The commonest allergic reaction due to skin contact is allergic contact dermatitis. This usually shows up 48-72 hours after you touch the allergen, like poison ivy, but in a hypersensitive person, the time-course can be accelerated. A skin reaction to an allergen for which the body has made ige shows up nearly immediately, within minutes. We use this when we do prick skin testing.
Answered 6/27/2012
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