Each Dr Pen device has a cartridge with tiny needles attached. When you turn your device on and place it the area you wish to treat, the cartridge needles will pulsate and glide along the skin to penetrate the upper layers of your skin to create deliberate trauma and micro-wounds. These wounds trigger a healing response from the body, which responds by producing collagen and elastin fibers. Over time, the skin becomes rejuvenated and reduces the appearance of fine lines, scarring, hyperpigmentation, loose skin and will brighten and improve your overall texture and tone. Read more about how microneedling works here.