Of course. You can develop an allergic reaction to any prescription medication. You could be allergic to the ester in the Enanthate. Allergic reactions are funny, they can happen at any given time, and they can even happen with a medication that you have taken daily for years. The human body is complex and often times difficult to understand.
Discontinue the use of whatever Drug is causing you problems. Allergic reactions can become quite serious without a moments notice (typicaly the get progressivly worse with each exposure) and can easily kill you.
Take some time away from anabolics. If you want to continue taking
AAS, I would try
Test Cyp or
Prop but avoid Enanthate and Sustanon, as it is common for Labs to add 100mg of Enan to most
Sust blends. And if you do choose to try the drug, be sure that you can get to medical attention immediatly if you develop problems. If it were me, I would probably not risk fate and simply choose Creatine over any
AAS out there.
Good luck, and remember that your health should always be your first concern.
Phreezer
allergic reaction to gear 
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