Leg / Varicose Veins
Spider veins are smaller, red, purple, and blue vessels. Spider veins are easily visible through the skin.
Varicose veins occur in the superficial veins in the leg. These veins have a system of valves which should ensure that the blood runs from the legs back up to the heart. Varicose veins occur when these valves fail, allowing blood to run back down into the veins in the leg, blocking these veins and causing them to dilate and become varicose.