What Are Wrinkles?

Wrinkles are lines, furrows, folds, and creases in the skin due to aging, sun damage, and a loss of collagen and elastin in the skin. Wrinkles are especially noticeable on the face in areas such as across the forehead, between the eyebrows (“frown lines”), at the outer corners of the eyes (“crow’s feet”), and around the mouth (“smile lines,” “marionette lines,” and “smoker’s lines”).