A beam of light, upon contact with the melanin (dark pigment of the skin) transforms its energy into heat. The hair has a very high concentration of melanin, so it absorbs the heat and it destroys the bulb that gives rise to the hair. The skin is not damaged because it has a lower concentration of pigment and receives very little heat. The clearer skin and darker hair, the greater the power that can be applied and the lower number of sessions required.
Our alexandrite laser has a cryogen device that cools the laser target protecting the epidermis. If you prefer, we also have an air cooling system that provides unparalleled comfort and the same security.