Discharge of black dirt during ovulation is not a normal phenomenon, it could be ovulation bleeding but it could also be caused by cervical disease. Discharge of black dirt during ovulation, which indicates a small amount of vaginal bleeding. The cause of this bleeding may be ovulation bleeding, but it may also be caused by cervical disease. 1. Ovulation bleeding. Most women basically have no discomfort during ovulation, although some women may have relatively large fluctuations in estrogen levels after ovulation, which may cause a small amount of endometrial shedding, resulting in a small amount of bleeding. This is not a normal phenomenon, but usually does not need to be treated. 2. Cervical disease. Women with a history of sexual intercourse who experience black dirt during ovulation need to be checked first for cervical disease, such as acute cervicitis, chronic cervicitis, cervical squamous intraepithelial neoplasia, and cervical cancer, all of which may lead to the appearance of intermenstrual bleeding or contact bleeding.