I am hearing this question more and more lately. I will explain the facial anatomy and what happens to the skin when the muscles of the brows, forehead and around the eyes are relaxed. The muscles that lift the brows up (levitators) are called the frontalis, this sheet of muscles cause the horizontal lines across the forehead. The muscles that pull the brows inward and down (depressors) are part of the glabellar region, these cause the "number 11's" or vertical lines between