Large black acne marks on the back can be eliminated through medication, laser treatment, and fruit acid resurfacing. 1. medication: large black acne marks on the back can be applied externally with hydroquinone cream on the back after bathing, which can promote the absorption of pigment and improve the situation of black acne marks on the back. 2. Laser treatment: commonly used laser treatment modalities are photorejuvenation, picosecond laser, photorejuvenation technology can be photothermal action to destroy melanin in the skin, while the picosecond laser can use the laser’s targeting effect, direct destruction of melanin, can promote the absorption and metabolism of the local pigment particles to improve the back of the black acne marks. 3. Fruit acid skin resurfacing: fruit acid peeling can exfoliate the skin, promote the metabolism of the skin melanin particles, thus promoting the regeneration of the skin epidermis, and then achieve the purpose of improving the back of black acne marks. Patients with large black acne marks on the back are advised to go to a regular hospital in time, under the guidance of specialists to carry out active treatment, do not take medication without authorization, to avoid adverse consequences.