Allergy to pantoprazole. In future.

I have noticed that when ever I take pantoprazole ( PAN D or 40 ). I get skin rashes and which develop in to puss like patches. My lips also swell and become numb..and then black patches develop on lips..But when I take Esomeprazole I don't get any sort of reactions.Recently, I was facing  IBS hence I had taken esomeprazole ( Nexpro 40) for almost 2 months but I didn't face any allergic reaction. Recently, I had under gone dental treatment and I was given antibiotics ( MOX CV 625) and Pan 40, as soon I took PAN 40 I got same reaction on my lips,fingers & palms. Now, I have stopped PAN 40 immediately. I just want to know whether this allergic reactions are due to any other reason or only allergy to that particular drug. What other precaution should I take in future..Which other drugs should I avoid in future. Thanks & Regards Shraddha Kadge