First off--what are you using? If this is your first cycle you're quickly gonna realize the pain of different esters, ESPECIALLY if you got good quality gear. All my gear is US pharmacy grade and to be honest, I pretty much just use sustanon or longer chained esters cause anything else, like prop or suspension, Effin huuuuuuurts. No homo, but your ass looks fine. Just relax, eat like a bodybuilder, sleep like a baby, fu** like a pornstar, and enjoy your cycle.
And the best way to tell if its a abscess is by pushing on the spot firmly for 5 sec. If your finger print stays deeply sunk in your skin like a memory foam mattress, get to the doctor ASAP. Otherwise, your fine, just give it time