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There’s never a more important time in your life to protect your skin from the sun than when you’re pregnant. The pregnancy hormones estrogen and progesterone are thought to make the pigment-producing skin cells (the melanocytes) react more strongly to sunlight, causing dark brown splotchy areas to appear on the chin, cheeks, nose, and forehead. Known as chloasma, melasma, or “the mask of pregnancy,” this condition affects up to 70 percent...