Welcome to HCM,
You are having coronary artery
disease and angioplasty
done with stent placement in Right coronary.
The medicine which you are taking regularly commonly prescribed like clopidogrel
If you have developed allergy
then it is possible that one of the drug or contents of drugs are causing allergy , the best way to know discuss with your treating physician and they can be stopped except the essential one and see if there is improvement then introducing other drugs one by one, but do it under supervision of Physician.
You can also discuss with Dermatologist
to try to identify offender drug if any then it can be changed with alternative.
Please also pay attention to diet and any particular antigen which specifically cause it.
Please take care