If they ask, tell them you sat on a nail. An infection is an infection, it doesn't necessarily matter how it got in there. My first two shots ever of sus, I got huge swollen lumps on my ass, that could easily have been mistaken as abcesses. The liquid was a nasty white pinkish shade when I pulled on the syringe. Very painful as well. Turned out just to be my body adjusting to the oil, and the injections. Antibiotics might help, but if its serious, they won't act fast enough, and surgery may be necessary to remove tissue surrounding the infection. If you're worried, better safe than sorry.