If these valves are weak or harmed, blood can move backward and pool inside the veins, triggering the veins to extend or twist. Sclerotherapy treats veins which have been twisted and enlarged, referred to as varicose veins. Varicose veins are frequently while in the legs. Sclerotherapy also treats spider veins, https://www.sgvascularctr.com/varicose-vein-treatment-in-singapore-answers-to-your-most-common-questions/