I'm a 16 year old male. for quite some time(2 or more years), I've had dark red and black bumps on the back of my right thigh. before, they never hurt, just when I would rub them really hard. in the past few days, one has grown from just a little lump to the size of a pea. now it hurts whenever i sit down. the cluster of lumps seem to be on a patch of fat. my family knows that they're there but not that they hurt and they're so big. i really don't want to see a doctor because it's pretty embarrassing. I kind of want to pop them with a needle but I'm afraid it'll become infected. if someone has advice, please help.