The black marks on legs are the melanin pigmentation after the local skin is traumatized or scratched, you can use ointment (such as hydroquinone cream) to apply to lighten the pigmentation, or you can use laser and other ways to remove the black marks. 1. Ointment application: the most commonly used ointment is hydroquinone cream, including azelaic acid cream, tretinoin cream, etc., which can inhibit melanin synthesis by melanocytes and effectively lighten hyperpigmentation. However, it should be noted that these drugs have a certain photosensitivity, and may appear certain skin irritation side effects, allergic to hydroquinone cream patients are prohibited. 2. Laser removal: laser can through the photothermal effect of the leg skin under the pigment particles broken, and then from their own body fluids circulating discharge, and can stimulate cellular reorganization and collagen regeneration, so that the skin becomes soft and glossy, and lighten hyperpigmentation. Specific use of which method needs to be decided according to the patient’s own situation, it is recommended that patients go to the hospital for advice, usually do a good job of sunscreen, eat more fresh fruits and vegetables, if you need to use drugs, under the guidance of the doctor to use, avoid unauthorized use of drugs.