Parrish and Jaenicke, researchers at the Harvard Medical School Dermatology Department, in the U.S.A., published in 1981, a major work about skin reactions to different kinds of light.

Based on these research results, the American company PhotoMedex projected and designed the XTRAC laser, the first laser approved in the USA for the treatment of psoriasis and vitiligo.

Studies that praise the therapeutic efficiency of XTRAC LASER are published every day. By virtue of its unique properties and ability to act directly on the inflammatory process immunity, XTRAC is a powerful instrument of healing, much more efficient than any other therapeutic resource.