Hyperpigmentation left behind by acne (referred to as “hyperpigmentation”) is a common acquired hyperpigmentation disease, which can usually be improved or removed through medication, phototherapy, etc. The details are as follows: 1. Medication: including topical medication, oral medication and chemical peeling treatment. Topical medication: local color deposition can be lightened with decolorants, such as hydroquinone cream, etc. Vitamin A acid drugs and glucocorticoid drugs can also be applied to alleviate the symptoms of color deposition. Oral medication: Some studies have shown that oral medication such as tranexamic acid and glutathione can also have a certain improvement effect on the discoloration. Chemical peeling: common chemical peeling agents such as salicylic acid and fruit acid can inhibit inflammatory reaction, and at the same time have the effect of keratin loosening and accelerating pigment metabolism. 2. Photoelectric therapy: including laser therapy, intense pulse light therapy and radio frequency therapy. Laser therapy: through the photothermal principle of laser, selectively destroying melanin particles in the pigmentation area, commonly used lasers include Q-switched laser, non-exfoliative fractional laser, etc. Intense pulsed light: Due to the selective absorption of light energy by melanin particles, the epidermis coagulates due to photothermal decomposition, and then micro-scabs are formed, thus improving or removing the pigmentation. Radiofrequency treatment: this technology can better improve or remove coloration, and is now widely used in pigmented skin diseases. Either of these treatments is recommended to be done under a doctor’s supervision. It is recommended that patients with post-acne hyperpigmentation go to the dermatology department of a regular hospital in time and follow the doctor’s instructions for standardized treatment.