If these valves are weak or destroyed, blood can move backward and pool inside the veins, triggering the veins to extend or twist. Sclerotherapy treats veins which might be twisted and enlarged, often known as varicose veins. Varicose veins are usually within the legs. Sclerotherapy also treats spider veins, a https://www.sgvascularctr.com/varicose-vein-treatment-in-singapore-answers-to-your-most-common-questions/