Well, the concentrated beam that removes unwanted hair emits a light that removes the hair from their very roots. Now, while this doesn’t lighten the skin (because it’s not designed to do so), there are some cases where patients claimed it lightened the skin in the targeted area.
To tell the truth, what happens is this treatment gives the illusion of a lightened skin. Yes, it removes the very root of the hair which gives off this expression. It’s just like waxing, as the waxing procedure causes darkness in different areas for no apparent reason.