Microsclerotherapy is the technique used to treat spider veins or thread veins of the legs. It is a procedure that involves injecting a liquid into the veins which destroys them and causes them to disappear over time. This treatment is done with a magnifying lens and an infrared vein mapping device. It is suitable for use on spider veins on the legs or body. As gravity has an effect on the blood in the veins and also as the skin is more sensitive to burns, microsclerotherapy is the most preferable treatment for thread veins below the heart.