Persistent venous insufficiency (CVI): A condition that comes about if the venous wall and/or valves as part of your leg veins are not working effectively, which makes it tough for blood to return to your heart from the legs. That is what comes about with varicose veins. They may bulge https://www.sgvascularctr.com/exploring-vascular-malformations-informative-guide-for-singaporeans/