Spider veins are the little webbed and branching purple and magenta lines that appear on the legs with age. They occur when valves inside the veins break causing blood to pool which subsequently dilates the vein. Spider veins are asymptomatic but can make the legs look mottled. At Gerson Zatezalo Skin + Face we treat spider veins with a painless procedure called sclerotherapy. Sclerotherapy involves injecting an irritant directly into the affected veins. The irritant causes the inner wall of the blood vessel to collapse and close. This results in the fading or disappearance of the spider veins on the skin surface. Typically, several treatments are needed to obtain desired results.