This technique is the main treatment option for spider veins. Occasionally, it is used for treating certain varicose veins. The technique involves injecting a diseased vein with a chemical called a sclerosant. This chemical causes the blood vessel to close up and eventually disappear. This treatment is performed in a short office visit and is often painless.
Using a very fine needle, the “sclerosing” chemical is injected into the diseased vein. In many cases the sclerosant can be more effectively administered using ultrasound guidance so as to visualize the vein. The chemical causes inflammation in the walls of the vein, causing them to swell shut and stick together. Each vein can require several injections and veins generally disappear in weeks to months. Results may continue to improve for up to one year. The vein shrivels and is eventually reabsorbed by the body. The procedure is usually painless, though you may experience a slight burning or tingling sensation. Most patients require multiple sessions in order to fully treat their spider veins.