Spider veins, or telangiectasias, are small red or purple blood vessels found most commonly on the lower extremities. They are hereditary and can form anywhere on the leg and even on the face. Varicose veins are larger veins that usually appear raised with a bluish color and can cause symptoms such as a dull ache. Although spider veins and varicose veins carry blood, they are not a crucial part of the venous system. They can be eliminated through a simple office procedure called SCLEROTHERAPY.