Sclerotherapy is a treatment where a sclerosing solution is injected into the abnormal vein. The solution causes a gradual closing of the vein lumen over several weeks. By varying the strength of the solution, this treatment can be used on telangiectasias, reticular, or varicose veins. The most common sclerosing solutions are sodium tetradecyl sulfate, pilodocanol, hypertonic saline, and glycerin.  Ultrasound guided sclerotherapy is used on varicose veins that cannot be seen at the skin surface. The ultrasound machine can visualize these veins and guide the doctor's injection into the vein.

 sclero pic

 Laser for Spider Veins

 A laser can be used to treat the spider veins measuring 0.1 to 1 mm in diameter. The skin laser is frequently paired with sclerotherapy to obtain the best cosmetic result when treating reticular and spider veins.