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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.
Age â As you age, your private areas naturally turn dark. This is attributed to hormonal changes. Genetics â You may inherit genes that cause dark skin in your private areas. Pregnancy â While you may not have dark skin in your private areas, you may develop the same during pregnancy.