Sclerotherapy is the process of injecting a medicine (called a sclerosant) into a vein. The sclerosant causes a small amount of chemical damage to the wall of the vein which then causes the walls to stick together, eventually resulting in closure of the vein. The blood is then re-routed to healthier veins without damaged valves and overall circulation improves. Aftеr the insertion of sclerosant, pressure is applied over the veins to prevent blood from pooling in the vein when you stand up. Your vein doctor will ask you to wear compression stockings for usually one week after the procedure.