Post-steroid side effects

I have what looks like normal bruising (black and blue and flat) on my vestibule but I also have what looks like a round black mass that is just beyond my vestibule. At first I thought it was clotted blood from the injections that I had on Monday (it's Wednesday today), but as I tried to move it/remove it I found that it was actually tissue. It is black and I have pain- burning stinging and just general ouch pain when I touch that area and generalized burning pain around my vestibule today. I emailed my doctor photos asking her if it was a normal side effect but I doubt she'll have a chance to look at the email until later tonight.