To prevent spotting, it is necessary to clarify the nature of its spots, which are common such as chloasma, sun spots, freckles and so on. 1. Melasma: Melasma is an acquired hyperpigmentation skin disease with unknown causes. It is mostly considered to be related to heredity, ultraviolet radiation, sex hormone level, etc. It may also have some relationship with liver diseases. Patients should pay attention to sun protection in daily life, so as not to cause skin pigmentation, leading to an increase in melanocyte particles. If there is an imbalance of sex hormones in the body, it is necessary to be admitted to the hospital for detailed laboratory tests to be corrected, which can delay the generation of pigmentation. For the existence of viral hepatitis, cirrhosis and other chronic liver diseases, liver function should be improved, which can also effectively prevent chloasma. 2. Sun spots: sun spots, also known as solar dermatitis, is an inflammatory reaction produced by excessive exposure of skin to ultraviolet rays. Attention should be paid to sunburn prevention in daily life by avoiding light, wearing sun hat, applying sunscreen, etc. At the same time, a lot of photosensitive food such as celery, spinach, fennel and oilseed rape should be avoided. 3. Freckles: Freckles occur on the face and are mainly characterized by dotted brown spots. Daily patients should pay attention to skin cleaning, consume more fresh fruits and vegetables rich in vitamin C and vitamin E, avoid eating photosensitive food, ensure sufficient sleep and rest, avoid staying up late, and take sun protection measures when going out to avoid excessive sunlight exposure. Patients with long spots can also choose physical methods such as fractional laser or photorejuvenation under the guidance of doctors according to their own conditions to achieve better therapeutic effects, and after treatment, they should keep their wounds clean and hygienic, and do a good job of sunscreen, hydration, moisturizing and so on.