The dark color of withdrawal bleeding is usually caused by the fact that the endometrium is not peeling off very well and the amount of withdrawal bleeding is relatively small. If this symptom occurs after taking emergency contraceptive pills, most of the time is due to taking emergency contraceptive pills in the first half of the menstrual cycle, the end of menstruation is too short, the endometrium has not been fully proliferated, taking emergency contraceptive pills stripped of the endometrium is very little and caused by this symptom, belongs to a normal physiological phenomenon does not need special treatment. If you take progesterone to promote menstruation in the case of delayed menstruation, the color of the retreating bleeding is black, mostly considered to be due to eating too cold food or using cold water to wash the face, feet, etc., resulting in cold invasion of the uterus due to this situation can be considered to take appropriate blood circulation and eliminate blood stasis of the drug treatment, such as motherwort granules, and also can be combined with the lower abdomen with hot compresses, massages, baking electricity, etc. to regulate the specific treatment measures. At the same time, you can also with the lower abdomen hot compresses, massage, baking electricity to regulate, specific treatment measures need to follow the doctor’s advice.