Laser is an acronym that stands for Light Amplification by the Stimulated Emission of Radiation. Simply put the energy produced by a laser is light energy, photons that are amplified through the device and emitted to produce the desired effects. While radiation is part of the acronym this is not ionizing radiation such as used in X-rays and does not pose long term health hazards or any increased risks of malignancy.
For lasers to produce a desired effect the laser energy must interact with the tissues that make up the skin. The laser beam can have different results depending on the optical properties of the intended target. The energy can be reflected, transmitted, scattered or absorbed.
Most of the effects caused by lasers are due to thermal reactions in the target tissues that can be reproduced reliably. Another way of saying this is that not all skin lesions/problems can be treated with lasers. Also not all skin lesions/problems can be treated with the same laser. A laser used for treatment of the skin has to be chosen based on the problem being considered for treatment and the expected or desired result. There are a large number of skin conditions that can be considered for laser treatment.
Laser can be used to treat a variety of skin complaints. These include tumors, warts, moles, tattoos, birthmarks, scars, wrinkles, and unwanted hair.
Adapted from original source: AOCD