As described above, an excimer laser is basically a highly concentrated beam of UV light, directed at vitiligo spots or patches, without affecting the pigmented skin around them. Developed by Dr. James Spencer at Mt. Sinai Hospital in New York, this treatment has the advantage of requiring no medications, and with virtually no side effects. Recently approved by the FDA, the treatment is more expensive than other methods, and often not covered by health insurance, however many dermatologists are offering excimer laser treatment in their offices.