Postpartum black lines on the stomach generally speaking about half a year or so can be almost recovered, but each person’s situation is different, so the exact time varies from person to person. Postpartum black lines on the stomach, generally due to hyperpigmentation, caused by estrogen changes during pregnancy, during pregnancy to promote black cell stimulation pigment has increased, resulting in the abdomen may have black lines appear. With the end of pregnancy and childbirth, maternal body hormones gradually return to pre-pregnancy levels, abdominal pigmentation will gradually fade until completely disappeared, usually within six months can be restored, but the specific recovery time varies from person to person. If there is any abnormality after delivery, it is recommended to seek timely medical examination and treatment.