During these laser vein removal treatments, the laser is passed over the skin at the targeted area. The heat from the laser then causes the walls of the veins to collapse. They then become scar tissue that is absorbed by the body. Thus, the varicose veins disappear. This has no impact on the effectiveness of the circulatory system since the treated veins were no longer functioning as they should anyway. Instead, the body replaces those veins with better ones.