If these valves are weak or damaged, blood can movement backward and pool from the veins, producing the veins to extend or twist. Sclerotherapy entails using a needle to put a solution to the vein. The sclerotherapy Alternative causes the vein to scar. The scarring forces blood through healthier veins. https://www.sgvascularctr.com/varicose-vein-treatment-in-singapore-answers-to-your-most-common-questions/