Possible causes of black marks on the face include nevus of Ota, facial melanosis, hyperpigmentation disorders caused by excessive ultraviolet radiation, etc., which can be improved with the help of medication and medical aesthetics treatments. 1. Nevus of Ota: Dark marks on the face that have been present since childhood or appeared during puberty, especially blue-gray or gray-brown spots or patches occurring around the eyes, temporal area, forehead and other parts of the face, may be caused by nevus of Ota. Such patients can be treated with the help of medical treatment measures such as alexandrite laser, ruby laser, Nd:YAG laser, etc., which in turn can effectively remove the black spots on the face. 2. Facial Melanosis: If the patients have the condition of taking anthraquinone laxatives frequently, long-term constipation, etc., and the black spots have the tendency of occurring in the mucous membrane part of their skin, then the black spots on the face may be caused by facial melanosis. In terms of treatment, patients with mild symptoms can apply arbutin cream, hydroquinone cream and other creams locally to help lighten the dark spots; serious people need to take tranexamic acid tablets, multivitamins and other drugs to assist in the treatment at the same time. 3. Hyperpigmentation caused by excessive ultraviolet radiation: When being outdoors for a long time, facial skin will be exposed to excessive ultraviolet radiation, which will stimulate melanocytes to synthesize more melanin to protect facial skin, resulting in sun spots, freckles, chloasma and other pigmented spots on the face. This kind of patients first need to pay attention to minimize outdoor activities and strengthen sun protection measures; for mild cases, topical application of hydroquinone cream, azelaic acid cream and other depigmenting agents can help to lighten the pigmentation spots, and can also be combined with aesthetic treatments such as chemical peeling and laser treatments; chloasma also needs to be combined with medication. As different types of facial pigmentation correspond to different optimal treatment plans, it is recommended that patients who are willing to be treated go to regular medical institutions for consultation, and the above treatments should be carried out under the guidance of specialists in order to avoid the occurrence of adverse reactions.