it sounds like it is gradually getting better with time. You probably just pierced up a nerve good. As long as it continues to get better I would wait it out. I've knotted myself out good when hitting a nerve. It's part of the game we play. If anything starts to worsen at all, I'd go see a doctor. You'd be in pain with an abscess. Also, if it happens anywhere else while injecting its time to start questioning the gear. I know you mentioned your source, so you should be fine there but I'm just saying...