Slide show: Sun damage
Image of uneven pigmentation
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To protect itself from the damaging effects of the sun, your skin increases its production of the brown pigment called melanin. The extra melanin makes your skin look darker or sun-tanned. Sometimes the sun causes an uneven increase in melanin production, which produces irregular coloring (pigmentation) of the skin. The sun can also cause a permanent stretching of small blood vessels, giving your skin a mottled, reddish appearance.

June 06, 2021