Sclerotherapy 

Spider veins occur as a result of a number of factors including hereditary and genetic predisposition, age, injury and prolonged periods of standing or flying on an airplane. 

Sclerotherapy is a procedure that decreases the visiblitiy of unsightly spider veins commonly found on the legs and thighs.  This procedure works by injecting the veins with a sclerosing solution which induces an irritation, and causes the veins to collapse and fade from view.  Two to four treatments are usually required and improvement is generally seen after each session.