Thread vein removal thread veins are small blood vessels near the surface of the skin using the i light 3 safe bursts of light are emitted to quickly remove these tiny veins the i light 3 carefully filters the light so only the correct wavelengths are allowed to reach your skin veins will gradually and safely disappear after treatment a number of factors can determine amount of treatments needed but usually 1 4 is what clinical studies have found spaced one month apart