See below: My best guess would be either an allergy to the medication or simply the release of histamine due to the medication. First, he needs to stop scratching, the sores will get infected. Get some otc Benadryl (diphenhydramine) or zyrtec (less sedating). Second, call his doctor to discuss this. He may need to try a different pain medication.
Answered 6/24/2014
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