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Quick Answer. During a menstrual cycle, the blood may become dark red or brown near the end of the cycle because the blood is older and is not being released as quickly. This is a normal color change during a menstrual cycle, explains WebMD. Continue Reading.
Change in appearance: What if one nipple suddenly seems darker than the other? This could be related to your period; wait and see if the change disappears over the course of your cycle. If it lasts longer than a month or so, ask your doctor about it. And what if your nipple suddenly becomes inverted it pulls in, instead of sticking out?