Laser resurfacing is a treatment to improve the look of the skin. It uses a laser to send out brief pulses of high-energy light. This light is absorbed by water and substances in the skin called chromophores. The light is changed into heat energy. The heat then destroys (vaporizes) thin sections of skin, layer by layer.
As the wounded area heals, new skin grows to replace the damaged skin that was removed during the laser treatment. Some lasers only tighten the skin by heating it but do not destroy the skin.
The CO2 (carbon dioxide) laser is the most common type of laser used for resurfacing. Erbium lasers are also used often.