Deep acne pigmentation refers to post-inflammatory hyperpigmentation, which can be reduced by medication and physical therapy. 1. Medication: For patients with post-inflammatory hyperpigmentation, topical hydroquinone, deoxyarbutin and other medications are needed to decolorize the affected area of the skin and achieve the purpose of reducing the deep pigmentation. In addition, you can also follow the doctor’s prescription oral niacinamide, tranexamic acid and other drugs to help the pigmentation fade. 2. Physical therapy: If the situation of post-inflammatory hyperpigmentation occurs, physical therapy can also be taken, a common method is laser therapy, through the principle of photothermal pigment decomposition in the affected area, to achieve the effect of lightening and removing hyperpigmentation. There are many ways to improve post-inflammatory hyperpigmentation, so it is recommended that patients go to regular hospitals and cooperate with doctors for standardized treatment.