More and more melanin spots on the face may be related to pigmented nevus, age spots, freckles, chloasma, etc., and the cause of the disease should be identified by timely consultation. 1. Pigmented spots: the etiology is not yet completely clear and may be related to many factors, among which genetic factors, external factors such as ultraviolet irradiation, changes in the level of sex hormones and bad living habits are important factors. 2. Age spots: i.e. seborrheic keratosis, long dark spots on the face of the elderly may be related to skin aging and hereditary factors. 3. Freckles: Freckles are associated with autosomal dominant inheritance, and external factors such as sunlight and ultraviolet radiation can promote and aggravate freckles. Generally, the age of onset is 5 to 6 years old, and the common site is the face. 4. Chloasma: Ultraviolet radiation, pregnancy, endocrine disorders, heredity and other factors may lead to the occurrence of chloasma. In addition to these factors, other causes cannot be ruled out. It is recommended that patients should consult doctors in time to clarify the causes of the disease and follow the doctor’s instructions to carry out standardized treatment.