Varicose veins are enlarged, often bluish, twisting leg veins that bulge above the surface of the skin. It is a common condition affecting many men and women, and is caused by increased blood pressure in the veins. Any vein that is close to the skin’s surface can become Varicose. The blood moves towards the heart by one -way valves in the veins. When the valves become weakened, faulty or damaged in the veins, that causes blood to flow in the wrong direction or to pool.