Has anyone here had an irritation when switching lubricant? We used the same kind a few years ago with no problems and then got a different type. Well a month ago we switched back and three times (out of many) the morning after sex now I got what feels and looks like a sore/friction burn on the inside of my vulva. I'm kind of freaking out (I got an appointment tomorrow at noon) thinking it might be an STD or something. We're not doing anything else different, and the only thing I can think of is either the lube or we weren't careful enough when I/he had a cold sore (though he doesn't have any symptoms or anything). Has anyone experienced something like that? Could it be something else?