Girls’ back acne marks are usually caused by post-inflammatory hyperpigmentation. It can be removed by topical medication, physical therapy, chemical peeling therapy, etc. In terms of treatment, it can be removed by topical medication, physical therapy and chemical peeling therapy. 1. Topical medications: For red acne marks on the back, you can use topical medications to repair the skin barrier, such as recombinant bovine basic fibroblast growth factor gel. For black acne marks on the back, topical application of mucopolysaccharide polysulfate cream and hydroquinone cream can be used to improve the situation. 2. Physical therapy: Back acne marks can be removed by intense pulsed light, pulsed dye laser and other photoelectric treatments under the guidance of specialists. 3. Chemical peeling therapy: chemical peeling agents containing hydroxyacetic acid and trichloroacetic acid can be used to improve back acne marks. For female patients with back acne marks, it is recommended to go to regular hospitals for timely examination and standardized treatment under the guidance of specialists.