Your skin doctor will first clean the area being treated. Next, they put a cool gel on your skin. Then, the medical expert will use a portable device to shine various light wavelengths onto the skin. To protect your eyes during treatment, you usually will be provided dark glasses. During the procedure, you may feel a slight sting on your skin, although the majority of people would seem not to. This light breaks down and heats the skin cells. The body then naturally removes the affected tissue. Most laser systems adjust their energy output through filters to treat particular areas.