Thread Veins Thread veins, also known as spider veins, are small, damaged veins that can appear on the surface of the legs or face. They are usually not painful or harmful, but some people may wish to treat them for cosmetic reasons. Whilst they are vascular, they are not a medical condition and will not be treated by Drs or hospitals. In the legs, spider veins can occur when the valves inside the veins stop working properly. Veins carry blood back to the heart, to prevent blood from flowing backward, they contain a one-way valve that closes once the blood passes through it. If this valve weakens or becomes damaged, the blood may struggle to flow in the correct direction, and it can begin to pool inside the vein. Over time, this can cause a bulge in the vein that branches out, resulting in spider veins. Spider veins on the face are often the result of tiny blood vessels bursting. Increased pressure or sun damage can cause this to occur. Most thread veins can be treated with laser sessions, the laser is a strong, focused beam of light that causes the spider vein to clot and dry up. Laser treatments are less invasive than sclerotherapy or closure system because there is no injection. Treatments: Laser Thread Vein Removal