To destroy the vein, our experienced professionals use a state-of-the-art laser to perform a minimally invasive procedure that allows the vein to be absorbed by the surrounding tissue and vanish. Varicose veins and spider veins are treated with lasers by dermatologists. As part of the laser treatment, your dermatologist directs the laser beam at the vein.   During laser treatment, heat is generated by the laser light and causes the vein to collapse. Depending on how many veins are being treated and how large the area is, you may need multiple treatments. There is a possibility that small spider veins will disappear immediately after treatment. Spider veins and varicose veins that are larger will darken, and they will likely be visible for one to three months before they disappear. It may take three or more treatments to get complete clearing in certain cases.