Asclera is a minimally invasive procedure done by your healthcare provider to treat uncomplicated spider veins and uncomplicated reticular veins. The treatment involves the injection of a solution into the affected veins. Asclera works by damaging the lining the inside of blood vessels, known as the endothelium. 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 clot and be replaced with tissue, reducing or eliminating the appearance of veins. The average sclerotherapy session takes anywhere from 15 to 45 minutes, with multiple Asclera injections per session.