Postpartum underarm dark pigmentation is a normal physiological phenomenon that eases as hormone levels fall back. If it doesn’t disappear for a long time, it can be removed by topical medication and physical therapy. 1. Topical medication: Postpartum underarm melanin precipitation is a normal physiological phenomenon, generally caused by elevated hormones during pregnancy, with the hormones falling back after delivery, can gradually disappear, but some people disappear more slowly. If there is no obvious change for a long time, you can apply hydroquinone cream and other drugs under the guidance of doctor, which can promote the melanin to subside. 2. Physical therapy: common laser treatment, such as fractional laser, Q laser and other methods, through the laser’s photothermal principle, selective action on the melanin particles in the epidermis, so that it produces a high temperature will be crushed by melanin particles through the lymphatic circulation metabolism, to achieve the effect of eliminating melanin. Specific removal methods need to be selected reasonably under the guidance of doctors according to the specific needs of patients and their conditions.