I have these, several. I paniced with the first one. Does it move or is it stuck in place? That is the big test to know if you have a problem. Next big question, is there something that has irratated it, or is it hurting for a reason? Other than being poked and proded all night.
Mine seem to move a bit. If they don't move they are more dangerous, if my memory isn't failing me. Mine are a fatty cysts common to diabetics. Unforunately once you have one you get more. I have only had one removed, it was on my leg right under where I put my keys. So that one had constant aggreviation. Unforunately it left a divot(sp?), so I haven't been excited to have any more removed.. Quick surgery in the docs office, healed fast too, fairly big scar.
Let us know what the doc says.