Black acne marks on the back can be eliminated by the following methods, such as medication, laser treatment, salicylic acid and fruit acid peeling. 1. Medication: Topical hydroquinone cream and tranexamic acid essence can be used for application. It is recommended to use the medication for topical application after each bath, which can promote the absorption of the skin and improve the phenomenon of black acne marks on the back. 2. Laser treatment: Picosecond laser or photorejuvenation can be used. Picosecond laser can destroy melanin particles in a targeted manner, while photorejuvenation destroys melanin particles through photothermal effect to improve the symptoms of black acne marks on the back. 3. Salicylic acid and fruit acid skin resurfacing: salicylic acid and fruit acid can achieve the purpose of exfoliation to promote skin regeneration, which can promote the metabolism of melanin particles, the use of which can improve the black acne marks on the back. Black acne marks on the back will affect the health and beauty of the skin, it is recommended to find the right way to treat according to their own situation, it is recommended to go to a regular hospital, under the guidance of the physician treatment.