Melanin on the face may be caused by endocrine disorders or freckles, which can be removed by topical medication and physical therapy according to the cause. 1. Endocrine disorders: some women will have color spots on both cheeks after pregnancy, and frequent exposure to ultraviolet rays will also cause the increase of melanin, and the melanin on the face will be obviously improved after giving liquid ammonia spray freezing treatment. 2. Freckles: Freckles and heredity have a certain relationship and can be removed by physical treatment, such as ultra-pulse light and picosecond laser. After treatment, we must pay attention to maintenance, pay attention to sun protection, often apply masks, and use more whitening and lightening skin care products. So facial melanin depends on the specific situation specific analysis, different melanin treatment methods are different, it is recommended that patients timely consultation, under the guidance of professional doctors, choose safe and effective treatment methods.