Melasma is a yellowish-brown pigmentation spot on the face, which has no obvious symptoms but seriously affects the facial value, mainly manifests as brown or dark brown patches, often symmetrically distributed on the face and cheeks in the shape of butterflies, and also involves the forehead, nose and neck. The causes of chloasma are mostly associated with internal diseases, such as endocrine disorders, Qi and blood disorders, and disorders of internal organs. In addition, nerve, emotional stimulation, gynecological diseases, liver, intestine, stomach and other diseases and factors can induce chloasma. In addition to internal diseases, the formation of chloasma is also related to the activity of human tyrosinase. Chloasma, gestation spot and liver spot should belong to the same disease, and the last two names reveal the two causes of the disease, and if chloasma occurs after pregnancy, it is called gestation spot, and if chloasma occurs after liver disease, it is called liver spot. The causes of chloasma are very complicated, according to the current data, the common causes include breast enlargement, uterine fibroids, ovarian cysts, menstrual disorders, liver and gallbladder diseases, endocrine diseases, thyroid diseases, heredity, diabetes, pregnancy, post-abortion, use of contraceptive pills, trauma, sunlight exposure, local use of ointment or cosmetics containing hormones, etc. Recent studies have found that chloasma is more likely to occur in young and middle-aged women, with the ratio of male to female being 1:15. In recent years, it has been found that the micro-ecological imbalance of the skin may also be related to the occurrence of melasma. However, the causes of melasma vary from person to person, and detailed medical history is needed to find out the specific causes. Melasma is usually regarded as a general cosmetic skin lesion because it is not aesthetically pleasing and has no other discomforting symptoms. In fact, the appearance of melasma is closely related to the internal condition of the body, and its harm is also multifaceted. It is a pigmentation spot on the face with irregular shape, symmetrical distribution, variable size and different shades of color. It is mainly distributed around the eyes, cheeks and cheek area around the mouth, and usually has no conscious symptoms.