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Why are lips red or pink?

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Why are lips red or pink?
posted Feb 19, 2018 by Munni Narang

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Your lips' red or pink pigment comes from underlying blood vessels -- red-colored, blood-filled capillaries are close to the thin skin on your lips. The transition of the reddish-pink outline of your lips to the rest of the skin is called the vermilion border, and it's found only in humans.
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answer Mar 11, 2018 by Willow Wilson
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