Being pregnant can frequently make existing moles grow larger, or make new ones appear, from the hormones. I suggest you have an examintaion by your OBGYN doctor to look at the growths. Yes, certain STDs can cause bumps on the labia (genital warts are the most common culprit) but as I said before, many pregnant women just sprout moles due to hormones. If the bumps you have are pregnancy related, they will get smaller and fade after the baby is born, so you do not need to remove them unless they are uncomfortable. Your OBGYN can tell the difference and remove the uncomfortable one if necessary. I hope this answered your question, and that this advice was helpful. Best regards, and good luck with your pregnancy.