Sclerotherapy is a proven, minimally invasive procedure used to improve the cosmetic appearance of spider veins and to relieve some of the symptoms associated with spider veins, including aching, burning, swelling and night cramps. It is the primary treatment for small varicose veins in the legs. Spider veins can develop from weak or damaged valves, hormone changes, exposure to sun and injuries. Sclerotherapy has been in use since the 1930’s and involves injecting a chemical solution directly into the varicose or spider vein. The solution causes the vein walls to swell, stick together and seal shut, stopping the flow of blood. As a result, the vein fades within a few weeks. Sclerotherapy is performed in office by a Nurse Practitioner, and the procedure itself takes approximately 15 to 45 minutes. The number of veins injected in one session depends on the size and location of the veins, as well as your general medical condition.