Thread veins, spider veins or broken capillaries are tiny, thin blood vessels that lie close to the surface of the skin and look red or sometimes purple. They are harmless but can make people feel very self-conscious, especially if on the face. Intense Pulsed light (IPL), Pulsed Dye Laser and Long Pulsed Nd YAG laser are highly effective when treating this condition. The thread vein is exposed to light energy, the temperature will rise in the area being treated. This damages and breaks down the vessels, which the body absorbs, making Thread veins less visible or destroying them completely.