Acne marks on the back are melanin deposits left behind after the inflammation of diseases such as acne or folliculitis subsides, which can be removed by medication and topical treatment. 1. Medication: Topical application of drugs such as hydroquinone cream, which degrades melanin particles and destroys melanocytes, is the most common decolorizing agent that can improve back acne marks; also other similar drugs such as vitamin C and tranexamic acid. 2.Local treatment: ① Chemical peeling: common if acid resurfacing, apply the appropriate concentration of fruit acids to the place with acne marks, by accelerating local skin metabolism to remove acne marks. ② laser treatment: using the photothermal principle of laser, the local melanin particles will be destroyed, to improve the effect of acne marks. ③ Blue light irradiation: Promote collagen generation through blue light irradiation, which is conducive to skin repair and can lighten acne marks and remove acne marks. Back acne marks generally have little impact on daily life, if you pay more attention to personal appearance and image, it is recommended to go to a regular hospital dermatology, under the guidance of the doctor to choose the appropriate treatment to remove acne marks.