Similar to the laser procedure, IPL sends signals with multiple wavelengths at the same instant. In the treatment of pigmented lesions (spots), the wavelength of light is calibrated in order that it is absorbed only by the target cells of the unwanted spot; this triggers thermal damage that leads to the elimination of the vacuole the principle at the base of pulsed light (IPL) is to release energy in the form of intense flashes of light while applying different filters depending on the kind of treatment. in which the pigment is contained. Over the following weeks, the pigmented lesions initially become darker, then dry out and flake off. Simultaneously, the production of new collagen by fibroblasts is induced, which contributes to the formation of new tissue.