Sclerotherapy works by injecting a small amount of medication into the damaged vein. This sclerosing agent will create a minor inflammatory reaction inside the vein, causing it to collapse. By eliminating the damaged vein, which will ultimately be absorbed naturally by the body, blood flow will actually improve as the body re-routes the blood through healthy veins. This procedure is perfect for smaller veins, and when performed early, future complications associated with larger varicose veins can be avoided.