Our expert says:
Usually food related hives are quite specific like nuts/ kiwifruit/ tomatoes/ citrus/ seafood/ eggs. He may have an allergy to something non-food related or to an ingredient in condiments like aromat/braai salt etc. (think of iodene in iodene enhanced salt for instance)
It may help if he takes a long acting antihistamine preventatively for a while ( e.g. Zyrtec or Clarityne)
If it persists I suggest he sees a dermatologist for further testing.
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