Your veins have blood for your coronary heart. Valves in these veins limit the blood move to at least one course. Valves that weaken or that don’t shut the right way cause blood to pool (collect) in the vein. This is termed a varicose vein. The injection treatment (or sclerotherapy) https://www.sgvascularctr.com/service/vein-diseases-varicose-veins/