Hi, welcome to the forum, your history is suggestive of that you are having drug allergy to codeine. Some patients have reported to have itching
(in more than 10%), rash and development of hives.
The possibilities for allergy are due to presence of Phenanthrene in opioids. You can even develop hypersensitivity reactions to other phenanthrene derivative opioid agonists ( hydrocodone (hycodan 1mg), hydromorphone, levorphanol, oxycodone, oxymorphone).