If we exclude congenital darker skin or personal facial hygiene problems, it may be due to external stimuli and pathological factors of the body, UV exposure is the most common reason for the darker color of the face than the neck. Some people, such as outdoor workers, do not have sun protection in place in their daily lives or do not apply sunscreen well. The facial skin is already sensitive and is exposed to long-term wind and sunlight, which can easily increase pigment synthesis, while the neck is covered by clothes, scarves, collars, etc., avoiding sunlight exposure, which will show that the facial skin color is darker than the neck. If you are exposed to more sunlight, such people should first pay attention to sun protection, usually wear a wide brimmed sun hat, carry a sunshade, sunglasses, and wear long clothes and long pants when going out. Before going out, do a good job of basic facial skin moisturizing, evenly apply sunscreen, isolation cream, choose sunscreen as much as possible to choose a regular brand, no fragrance, color, mineral oil sunscreen. The higher the sunscreen factor is, the more chemical ingredients are added, and ordinary cleaning cannot be completely cleaned up. In addition, the face is darker than the neck may be related to endocrine disorders caused by bad habits, such as stress, paranoia, staying up late or long-term use of hormonal drugs, which can lead to increased melanin. If the face has suffered from freckles, chloasma, melanosis and other skin diseases, it is also easy to lead to deepening of skin pigmentation. If the color of the face changes within a short period of time, when the color becomes black and the skin is dull and lusterless, it suggests some internal lesions, such as chronic kidney disease caused by chronic kidney failure, and it is recommended to actively go to the hospital for diagnosis and treatment. When the face is darker than the neck, it is usually not caused by disease and can be observed and judged first. Use regular whitening, skin care and sunscreen products with little side effects in daily life, eat more vegetables and fruits rich in vitamin C, get enough sleep, don’t stay up late, avoid overworking, and go to the hospital for examination and treatment in time if there are symptoms that tend to be heavy.