I'm allergic to deca as well. I have run two deca and test cycles. I used pharm grade deca and UGL deca which gave me the same hives rash and swelling near and below the injection site. The rash is quite itchy. I have tested by doing a deca only shot on one part of my body. The rash develops about 1-2 days after pinning, and lasts for several days. It's not the ba or oil I am having a reaction to. The pharm grade and UGL test I use from the same companies does not produce this allergic reaction.