Acne marks and pigmentation on the back are usually symptoms left behind after the inflammation of acne, folliculitis and other diseases subside. Patients can relieve the symptoms through medication and physical therapy. 1. Medication: Patients can use topical medications such as retinoic acid cream and hydroquinone ointment, which can accelerate local melanin metabolism and thus play a role in pigmentation. The above drugs should be used under the guidance of a doctor, and patients should not use them on their own, so as not to delay the condition. 2. Physical therapy: patients can under the guidance of the doctor for laser treatment. The photothermal principle of laser can destroy the local melanin particles, so as to improve the role of acne pigmentation. In addition, blue light irradiation can also be carried out, which can promote collagen production, and then promote skin repair. Patients with acne marks and pigmentation on the back should go to the hospital in time for standardized treatment under the guidance of doctors.