The acronym stands for light amplification by stimulated emission of radiation. Ordinary light is made up of different colors corresponding to a particular wavelength. This light is also scattered and unfocused. Laser light on the other hand, emits a light of one particular wavelength such as yellow green or red. Different tissues in the body absorb the laser light with a specific intensity.
During treatment, the laser emits aflash of light which feels like a light rubber band snapping on the skin. The treated area may look slightly inflamed for a few days but unlike the pulsed dye laser, there is no bruising. Normal activities may be resumed immediately after treatment but the treated area should be protected from direct exposure to the sun and tanning is not advised until the skin has returned to normal in two to three weeks.
The image on the right shows before and after one treatment for vascular lesions.