Vein therapy removes unsightly veins or reduces their look. Sclerotherapy treats red, blue or purple veins by a solution injection to collapse and close off the vein blood supply. Varicose veins are caused by broken one-way valves that prevent blood from returning to the heart. The blood flows downward and the pressure backs up into veins beneath the skin surface. Varicose vein removal, AKA phlebectomy, relieves symptoms via surgery, wearing compression socks or lifestyle changes. Laser vein treatment uses a light beam to treat veins by causing them to shrink and close. The energy from the laser is absorbed by hemoglobin and heats up and closes without harming surrounding tissue.