1st cycle I have tried with site injecting. Some swear by it, so I figure I wouldn't know until I tried.
We are using the same test, but this was the 7th injection of the test for me. His doc told him he probably missed the muscle when he injected. His wife gave him a shot at the bottom of the tricep, where the muscle is so small its hard to get it there anyways.
I hope it goes away for you bro, let us know. If it does end up being a infection I would not trust that gear at all and discontinue it, but I would definitely go back to single glute or quad shots.