Spider veins are formed by enlargement of small groups of blood vessels close to the surface of the skin and are commonly found on the face and legs.  Varicose veins are abnormally swollen and weak leg veins that may be painful.  The exact causes of spider and varicose veins are unknown but family history, pregnancy, obesity, and hormonal changes may be contributing factors.  Treatments include laser surgery that uses high intensity light to destroy the blood vessels.  Sclerotherapy utilizes injection techniques to eliminate the blood vessels.  Surgical phlebectomy (vein removal) may be required for large, severe varicose veins.