Crow’s feet are dynamic wrinkles that are most apparent when the facial muscles are smiling or the eyes are squinting. 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 form from repeated muscle activity associated with frowning. Over time the muscles become stronger. Meanwhile, due to aging, the skin becomes less elastic and thinner resulting in the vertical lines we call “frown lines”. Horizontal lines on the forehead can be due to repeatedly raising the eyebrows.

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