Sclerotherapy remains the primary treatment for small-vessel varicose disease of the lower extremities.  These small vessels include telangiectasias, venulectasias, and reticular ectasias.  Telangiectasias are flat red vessels smaller than 1 mm in diameter.  Venulectasias are blue, sometimes distended above the skin surface, and smaller than 2 mm in diameter.  Reticular veins have a cyanotic hue and are 2-4 mm in diameter.  Large varicosities do not respond as well as small varicosities to sclerotherapy.