Your hormones, estrogen and progesterone, increase greatly during pregnancy. These hormones help the baby grow and help your body change in ways that will nourish the baby and prepare for delivery. Progesterone and estrogen are in effect, growth hormones. Other things will grow, your breasts, your abdomen, your hair, but unfortunately if you have a small skin tag it will also then grow as well and become a medium size skin tag. This is because of your skyrocketing levels of progesterone. You can have skin tags surgically removed at a dermatology office if you like, but most of them will shrink in size after the delivery, so that is probably not necessary. If they are getting caught underneath a bra strap and making you uncomfortable, consider having it removed. Short of that, wait until delivery and let it shrink on its own.