Sclerotherapy (SKLER-o-ther-ah-pe) uses a liquid chemical to close off a varicose vein. The chemical is injected into the vein to cause irritation and scarring inside the vein. The irritation and scarring cause the vein to close off, and it fades away.

This procedure often is used to treat smaller varicose veins and spider veins. It can be done in your doctor’s office, while you stand. You may need several treatments to completely close off a vein.

Treatments typically are done every 4 to 6 weeks. Following treatments, your legs will be wrapped in elastic bandaging to help with healing and decrease swelling.

Source: National Heart, Lung, and Blood Institute; National Institutes of Health; U.S. Department of Health and Human Services.