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Wrinkle

A wrinkle, also known as a rhytid, is a fold, ridge or crease in an otherwise smooth surface, such as on skin or fabric. Skin wrinkles typically appear as a result of ageing processes such as glycation, habitual sleeping positions, loss of body mass, sun damage, or temporarily, as the result of prolonged immersion in water. Age wrinkling in the skin is promoted by habitual facial expressions, aging, sun damage, smoking, poor hydration, and various other factors.

In humans, it can also be prevented to some degree by avoiding excessive solar exposure and through diet.

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Source: Wikipedia · Image: Wikimedia Commons · CC BY 2.0

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