So for a while now I've had this bumb in my groin area. Its no bigger than a pencil eraser. I have no idea what it could be from, but a few days ago it popped and reappeared in the next day. Its painful to run, wipe after usingnthe bathroom and cross my legs. I'm a virgin, so I know it couldn't be an std but I'm afraid to go to the doctor because if its cancer, I don't want to know. Please help me.