I googled 'hemorrhoid' (good ol' google

) and this is what it said:
pain caused by venous swelling at or inside the anal sphincter.
So basically its a vein that has swelled and causes itching and burning, usually women get them after they've had a baby..
..In either case bring it up to your doctor when you go for your pap smear, then she/he can tell you what it is for sure, and what you can do to help get rid of them.