The melanin precipitation of seborrheic dermatitis may be caused by post-inflammatory hyperpigmentation, which is recommended to be removed by general treatment, medication and physical therapy. 1. General treatment: For patients with post-inflammatory hyperpigmentation, firstly, they need to pay attention to sun protection to prevent aggravation of hyperpigmentation. Secondly, it is also necessary to pay attention to personal hygiene to facilitate the improvement of symptoms. 2. Medication: Hydroquinone, deoxyarbutin and other decolorizing agents can decolorize local hyperpigmentation, thus helping to lighten and remove hyperpigmentation, and it is recommended that patients apply such drugs as prescribed by the doctor. 3. Physical therapy: laser treatment has a certain effect on the removal of pigmentation, is based on the principle of photothermal, selective destruction of subcutaneous deposition of melanin, is conducive to the removal of pigmentation. There are many ways to remove post-inflammatory hyperpigmentation, and it is recommended that patients go to regular hospitals and cooperate with doctors for standardized treatment.