Whether it is after a normal delivery or a cesarean section, usually 23 days after the delivery, the bad dew turns into blood again, which is generally a normal physiological manifestation, this is due to the uterus contraction leads to the formation of ecchymosis tissue exfoliation. After delivery, the uterus will not be in continuous contraction, but intermittent contraction, which will lead to intermittent discharge of the uterine cavity, so there may be a small amount of blood after the discharge is cleared. As long as the discharge is completely and thoroughly cleared within 42 days after delivery, it is a physiological manifestation and does not require any treatment, with routine checkups on the 42nd day after delivery.