Chitosan azelate is used in freckle-removing skin care cosmetics. It not only has the antibacterial effect of azelaic acid, eliminates melanin and acne, but also has chitosan biocompatibility and film-forming properties, which can inhibit bacteria and mold. It also inhibits the activity of melanin-forming enzymes. Compared with other freckle-removing skin care cosmetics, the advantage of this product is that the effective content of azelaic acid is higher, which can reach 4% of the total weight. It integrates the advantages of antibacterial, freckle, acne, whitening, moisturizing and anti-wrinkle. As a cosmetic or cosmetic raw material, it has no adverse side effects.