The dark color of menstruation may be caused by the fact that the blood volume of menstruation is relatively small, and it stays in the uterine cavity and vagina for a long time. The dark color is caused by oxidation reaction, especially on the first day of menstruation and when menstruation is about to end. If it is not accompanied by too much or too little menstruation or the change of menstrual cycle time, no special treatment is required, as long as the local sanitation is kept. Due to the decline of physical resistance of women during menstruation, and the opening of the cervical orifice and pelvic cavity, it is necessary to pay attention to the cleanness of the vulva, adhere to the use of warm water every day, and avoid the use of unqualified sanitary napkins and pads. In addition, underpants should also be replaced and cleaned in time, which can be sterilized in the sun.
