Asclera® is an injection used in a procedure called sclerotherapy to treat two types of veins: 1) uncomplicated spider veins (very small varicose veins ≤ 1 mm in diameter) and 2) uncomplicated small varicose veins (1 to 3 mm in diameter) known as reticular veins. Asclera® is injected into the vein and 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 clot. Over time, the clotted vein will be replaced with tissue and veins will appear less noticeable. Following treatment compression stockings or support hose should be worn continuously for 2-3 days and for 2-3 weeks during the daytime. Repeat sessions may be necessary. If additional treatment sessions are required they are usually repeated by 1-2 weeks.