Black marks after shaving may be due to the root of the beard is not shaved clean, may also be the process of shaving skin damage caused by inflammatory hyperpigmentation, can be improved under the guidance of the doctor through medication or laser treatment. 1. Beard not shaved clean: the black marks left behind by the beard not shaved clean, you can change the appropriate razor to improve. 2. Post-inflammatory hyperpigmentation: It can be improved by using medications such as Mucopolysaccharides Polysulfate Cream, Hydroquinone Cream Vitamin C Extract under the guidance of a doctor, or by laser, such as Intense Pulsed Light treatment. When patients shave the beard after leaving black marks, if self-conscious about the impact on aesthetics, it is recommended to go to a regular hospital in a timely manner, under the guidance of a professional doctor for symptomatic treatment.