1 doctor weighed in:

How long does a minor allergic reaction last like a minor itchy rash?? Without any medication??

1 doctor weighed in
Dr. Al Hegab
Internal Medicine - Allergy & Immunology

In brief: Depends

On the stimulus (allergen), the route, and the exposure duration, if ingested might take some time till eliminated, at any rate if it is minor as you described it should be only hours at the most

In brief: Depends

On the stimulus (allergen), the route, and the exposure duration, if ingested might take some time till eliminated, at any rate if it is minor as you described it should be only hours at the most
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