I have discovered 3 tiny brownish coloured lumps on my vulva that kind of look like blisters. They don't itch and they aren't sore. My partner doesn't have any of them. They popped up late in my third trimester of pregnancy and disappeared until recently. I have recently got a pap smear done but my OB hasn't called saying anything looked bad (got it 2 weeks ago). What can they be??