Sclerotherpay remains the gold standard treatment for unsightly spider veins and feeder veins. The FDA approved sclerosing solution, Asclera®, is injected into the problem vein causing it to close and eventually disappear. Asclera® is a prescription medicine that is injected into unsightly spider veins and feeder veins. It works by damaging the endothelium, the cells lining the inside of blood vessels. This causes blood platelets and cellular debris to attach to the lining of the vessels; eventually, cellular debris and platelets cause the blood vessel to close. Over time, the closed vein will be absorbed by the body and replaced with tissue.