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Creases, folds, and ridges that form on the skin as a person ages are called wrinkles. Wrinkles appear more commonly in the parts of the skin that are exposed to the sun most, like face, neck, arms, and back of the hand. It can also be caused due to smoking, dehydration, a few medicines, genetic factors, and other environmental factors. The UV light in the sun rays causes the most damage, as they breakdown the elastin and collagen fibers that support the skin. This makes the skin weaker and less flexible, which results in wrinkles. So, avoid sunbathing and artificial tan sprays, and limit the time you spend outdoors.