If these valves are weak or harmed, blood can circulation backward and pool while in the veins, triggering the veins to stretch or twist. Sclerotherapy treats veins that happen to be twisted and enlarged, known as varicose veins. Varicose veins usually are during the legs. Sclerotherapy also treats spider veins, https://www.sgvascularctr.com/varicose-vein-treatment-in-singapore-answers-to-your-most-common-questions/