Varicose veins often pop up and out in the lower parts of your legs and thighs during pregnancy. Varicose, or spider, veins are those blue, red, or purple spidery lines under your skin that may be raised and twisted. Many varicose veins become more pronounced as your pregnancy progresses and less pronounced after pregnancy, but some, like stretch marks, are permanent additions to your body. You can prevent permanent damage to your vein walls by exercising regularly and trying not to stand still for too long. It's also a good idea to elevate your legs when you can, sit with your legs uncrossed, and wear good support hose.
Some varicose veins are pain free, but others do cause a little or a lot of pain and discomfort.
Remember, that the worst will disappear, but talk to your doctor if your pain is severe. Almost ninety percent of mothers to be notice some darkening of their skin, and this is thought to be caused by high estrogen levels. Minimize the darkness of these spots by protecting yourself from the sun, and if you are very bothered by them, talk to your doctor. More severe cases can be treated by an ointment available by prescription. The skin change you should concern yourself with most is not specific to pregnancy, but it is too often ignored during pregnancy.