Buttocks generally refers to the buttocks. Buttocks black with long-term sedentary, acanthosis nigricans, post-inflammatory hyperpigmentation and other factors, can be targeted treatment to improve, usually including general treatment, drug therapy and physical therapy and other methods. 1. Long-term sedentary black: often long-term sedentary people’s buttocks are prone to stimulation resulting in local pigmentation residue so that the patient’s buttocks black, such patients should reduce the time of sitting and standing, to reduce the stimulation of the skin, if the color is darker, hydroquinone ointment can be used to alleviate the symptoms of hyperpigmentation. 2. Acanthosis nigricans: some patients with dark buttocks may be caused by acanthosis nigricans, such patients are more obese, patients should pay attention to weight control, reduce body fat, which can gradually improve the symptoms. 3. Post-inflammatory hyperpigmentation: If the buttocks suffer from dermatitis, eczema and other inflammatory diseases, it is easy to leave hyperpigmentation after healing, resulting in dark buttocks, which can be gradually faded, during which the patient can also be coated with hydroquinone ointment, arbutin deoxygenation, and oral vitamin C, aminocyclic acid, and other medicines to promote the recovery. In addition, physical methods such as laser can also be taken. Buttock blackening may have other causes, it is recommended to go to the hospital, a clear diagnosis, symptomatic treatment, medication should be used in accordance with medical advice.