After each treatment, you will notice improvement of your skin's appearance. However, it is important to realize that new spider veins may surface in the future. As time passes, you may want to consider further treatment to take care of any new veins that may emerge.
The practice of medicine and surgery is not an exact science. Although good results are expected, there is no guarantee. Be sure to discuss with your surgeon the results expected in your case, as well as the cost involved.