Our expert says:
The symptoms and signs are suggestive of an allergy, but with negative skin prick testing and allergy blood tests to peanut, peanut is evidently not the cause and you must ave consumed another allergen that caused the reaction. Perhaps sesame or another product in the cracker. Other possibility would be some form of medication you took around the same time you ate the peanut butter cracker. You will need to do some detective work.
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