Q-switch Nd:Yag Laser laser treatment is a non-invasive and painless process The Q-switch lasers use an invisible beam of light to target the brown pigment (melanin) present in the dark patches of your skin. This pigment absorbs the laser energy, which is then dispersed and absorbed by the body. The treatment thus leaves you with smooth, even-toned skin. Moreover, the laser only targets the pigmented areas of your skin.This ensures that the surrounding skin is not harmed in the process.