If you've been noticing darker nipples, moles or a dark line down your belly, don't worry -- this is very common.
Your hormones are at work again now that it's the end of your 2nd trimester. This time they're causing pigment changes in your skin. Your nipples are getting darker, as are your freckles. You may have a dark line of skin dividing your growing belly in half. This common complexion change is called "linea nigra" and is the result of darkening skin pigment during pregnancy; it usually fades or disappears completely over a few months after your baby is born. Other more bothersome changes may occur. If your skin starts to trouble you, ask your doctor about skin treatments that are safe during pregnancy. The medications that worked for you prepregnancy may cause birth defects.
Originally published in You & Your Baby: Pregnancy.
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