The black acne marks left behind by back acne is the color deposition after the recovery of acne inflammation, patients can be removed through medication, laser treatment and other ways. 1. Medication: Black acne marks may be caused by melanin precipitation, patients can under the guidance of the doctor for medication such as arbutin cream, hydroquinone cream and other drugs, can be more effective to improve the pigmentation. 2. Laser treatment: If the formation of acne marks for a longer period of time, the role of the application of ointment is generally smaller, the patient can go to the local regular hospital for laser treatment such as intense pulsed light, picoseconds, etc. to help remove melanin deposits. Black acne marks need to remove the person should be timely consultation, the specific removal methods need to be under the guidance of a professional physician to avoid causing adverse reactions.