Around. Laser 532 optical head is a kind of skin treatment equipment, which can be used to remove forehead pigmentation. Usually it takes some time to see the obvious effect after laser treatment. The exact time varies from person to person. In the first week after laser treatment, the skin will have discomfort symptoms such as redness and itching, which is a normal reaction. In the next four weeks, the skin will gradually return to normal, but avoid direct sunlight and use irritating cosmetics.