Crow’s feet are dynamic wrinkles as they are most apparent when the facial muscles are involved in smiling or squinting of the eyes. These lines radiating from the corners of the eyes can be one of the earliest signs of age-related facial changes. A deterioration in the quality of the skin, such as from cigarette smoking or UV exposure may also relate to the development of crow’s feet.

Lines between the eyebrows can be formed from repeated muscle activity associated with frowning. Over time the muscles become stronger and, at the same time, due to aging the skin becomes less elastic and thinner resulting in the vertical lines we call “frown lines”. Horizontal lines on the forehead are can be due to repeatedly raising the eyebrows.

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