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Retained menses: These can be another reason for black period blood. It would mean that the menses are being retained in the uterus or in vagina. It can be retained in vagina, the hymen covers the vagina completely and does not allow blood to flow out until pushed by contractions from uterus.
What does black period blood mean? this month i started my period exactly when i was supposed to, the problem was the blood is coming out in a strange dark, dark color almost like a black. Update: I know for a total and complete 100% fact that neither of us has an STD.