I did this when preg with DS, on the iron (note to self, do not iron naked when 9 mo pregnant, lol!!) The only thing the Dr was concerned about was the possibility of it being deep enough to do damage to my uterus. If it's just on the surface, you can just treat it like any burn, and you porobably want to keep a loose dressing on it to avoid it getting irritated or the blisters breaking and getting infected. I hope it feels better soon!!