Black spots on the skin are considered to be caused by pigmented nevus, post-inflammatory hyperpigmentation and so on, which can be removed by laser, surgery and other ways. 1. Pigmented nevus: Pigmented nevus is a benign skin tumor formed by nevus cells. Nevus pigmentosus can occur in any position of the skin and generally does not need to be treated. If it consciously affects the aesthetics, it can be removed by laser or surgery. 2. Post-inflammatory hyperpigmentation: If the patient’s skin has been traumatized recently, or there are inflammatory skin diseases, etc., it may lead to localized pigmentation left on the skin, which generally does not need special treatment and can subside on its own after a period of time. Black spots on the skin may also be other reasons, should be timely to the hospital, so as not to delay the condition or cause adverse reactions.