Perineum Conundrum

I've never in my life has this issue before, in fact I just found out that it is my perineum. It's swelling, before it was just like a small movable bump under the skin. Now it's full blown swollen and it hurts. I'm going to the gyno Nov 2nd, but it's irritating me so much that I've just got to ask what this is?! I don't have any STDs, nor am I pregnant. (at least to my knowledge). What on earth could it be?! Anyone have any idea?! Thank!!