Help! Itchy shoulder.....WTF??

This is my first time on injection so i'm kinda concerned. I have gone thru 4 shots so far of spectra labs DECA. 2 in the left shoulder and 2 in the right. When i did my right shoulder wednesday nite when i woke up it was itchy as hell. It is a couple days since and it is still itchy, not as bad but its still there. Has anyone ever had this? Is this an allergic reaction? I'm wondering whats going on and if its bad. I dont want to stop but would it get worse?
Thanks in advance for any help.
:unsure:

That happens to me sometimes, I personally dont think it's a big deal. It never has gotten any worse for me. It may be a reaction to the BA or alcohol. Just make sure ur being sterile with ur stuff and you'll be safe. Hope that helps bro.

Feewww, yes it did help.
Thanks for responding brs.