Fractionated laser treatments use tiny beams of laser energy that penetrate deep into the skin, creating small zones of heat injury. Areas of the outer layer of skin (epidermis) where the laser penetrates are removed, the underlying skin (dermis) is heated. Areas outside the laser zones are not damaged. The zones of injury stimulate the production of collagen, healthy new skin cells begin to grown. After the healing process, the new skin can appear tighter, smoother and firmer.