Sclerotherapy is an effective treatment that provides long-lasting results by permanently disabling and removing unwanted veins near the surface of the skin. The treatment works by stimulating the cells within the vein. The injected medicine is designed to trigger a healing response within the patient, so the treated veins send blood platelets to address the perceived “injury.” But, the body has been fooled, because there is no injury, so the platelets only serve to disable the vein. It is gradually replaced with new and healthy tissue while it recedes from view. However, despite this treatment’s permanent results, your body is continually growing new veins, which can potentially become spider veins over time.