An abscess is a localized collection of pus in any part of the body
that is surrounded by swelling (inflammation).
Just because you missed a shot, which I'm pretty sure is what JamesBrown is talking about doesn't mean you have an abscess. You should NEVER IM any street drugs or pills. IV it, snort it, or plug it. IMing will result in abscesses and no, watering it down will not help.
JamesBrown.. when you IM, you go into the muscle.. I think you are talking about missing a shot IVing which would result in a subcutaneous injection.. the bump you see and massage away is just a miss. If you don't miss a shit ton it usually goes away, but sometimes may get infected and result in an abscess.