Many men and women are bothered by clusters of red, blue or purple veins that appear on the thighs, calves and ankles. There are many factors that cause these veins, known as telangiectasias, to develop including heredity, pregnancy, hormonal influences, obesity and prolonged standing and sitting. Spider veins of the legs take on one of three shapes; spider shape with a group of veins radiating out from the center, barbarizing (sunburst appearing) or linear. Varicose veins are larger, darker in color and usually bulging. Treatment options for spider veins include sclerotherapy, involving the injection of a specialized solution to collapse the veins, and laser vein removal. Very often a treatment regimen consists of both procedures.