Sclerotherapy is a nonsurgical treatment to get rid of varicose veins. A chemical called a sclerosant is injected into the varicose vein, causing it to close.

Sclerotherapy may be used to make spider veins and small varicose veins go away or become less visible. It is usually done only for cosmetic reasons because these types of varicose veins rarely cause symptoms or problems. It might be done along with other procedures to treat varicose veins.