Leukorrhea is black may be as follows: First, gynecological inflammation, such as common vaginitis, pelvic inflammatory disease, endometritis and tubal inflammation, because the formation of leukorrhea has a certain relationship with these organs, especially the vagina and ovaries, especially when there is vaginitis and ovarian inflammation, the inflammation of the infection, bacterial secretion material, as well as necrosis of the skin and mucous membrane of the diseased area, and so on, can lead to leukorrhea. The formation process is abnormal leading to the leukorrhea is black. Secondly, there is blood stasis in the body, when there is blood stasis in the body of women, the hemoglobin content in the blood will be reduced, which leads to the blood in the stasis area showing dark red or even black, and this blood can be mixed into the leukorrhea to cause the leukorrhea to show black.