Hi Dana,
Did you look with a mirror? Perhaps you have varicose veins there, and you see a big blue vein on the lips? In both cases, with or without veins, the most important thing is to not stay standing or sitting for too long and to try to take breaks and lie down, on you side, and raise your hips with a pillow. Try doing this every 2 hours for half an hour. You can also try a maternity belt or girdle to raise your stomach. Some women are helped by putting a stiff sponge between two pairs of underwear. You can try ice or magnesium compresses, as it may help. Also compresses with white oak bark (quercus alba)and hemamelas tea reduce swelling.The baby may change it's position which can make the swelling better. It is not dangerous and has nothing to do with tearing at the birth. You can use the epi-no unless you have varicose veins in the vulva. Ilana Shemesh