Vulvar varicosities, or varicose veins of the vulva, are thought to affect 18-22% of pregnant women. Predominantly due to increased blood flow to the pelvic region and more common in women who have had two or more full-term pregnancies, their prevalence is probably underestimated because of a reluctance to seek medical advice. Often simple observation is the optimum treatment, as most cases will subside upon delivery. In severe cases the veins can be surgically removed, however, this is rare. For many women, the only symptom is a feeling of pressure in the pelvic region. If the veins swell significantly they may feel lumpy to the touch and have a blue-ish tinge.
Read more about the changes accompanying pregnancy.