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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.
Cancer is another cause of vaginal bleeding that is not related to menses â intermenstrual bleeding. It is, however, not a common cause of brown to black vaginal bleeding. An ulceration of the reproductive tract may cause bleeding and if the outflow is restricted or complicated with pelvic inflammatory disease (infection) then there may be a dark brown to black vaginal bleed usually presenting as spotting.