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contrast dye CT Scan Hives

I had a CT Scan on Thursday and developed hives that seemed to appear more on Friday -still have them on Saturday.
Taking Benadryl - How long can I expect the hives to last? My torso, arms are all with hives.
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Hi,
      Hives can appear due to allergy to food, dust, animals or any item that can cause hypersensitivity or they can also appear out of no reason. Hives usually last 24 hours but can stay for days to weeks. It is important to see a dermatologist for confirmation of diagnosis. Treatment is with antihistamines, corticosteroids or immunomodulators. Hope this helps. Best.
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