Melasma is an acquired melanin hyperpigmentation skin disease, mostly seen in young and middle-aged women. The disease is distributed in the forehead, cheekbones and perioral area, and the melasma on the nose and its two sides are often fused with each other in the shape of butterfly, so it is commonly called “butterfly spot”. The causes and mechanisms of the disease are not yet fully understood. It is generally believed that it is related to endocrine disorders caused by heredity, sun exposure, pregnancy, medication and chronic liver disease, tuberculosis, female reproductive system diseases, etc. Among them, sun exposure is a contributing factor to the onset and aggravation of melasma. Melasma, also known as butterfly spots, is related to pigmentation in human body, suggesting that it is caused by the increase of melanin in the body and its accumulation in the basal cells of the skin, which comes from tyrosine and is oxidized and polymerized under the catalyst of tyrosinase. Endocrine disorders: pigment metabolism and body endocrine has a great relationship, such as people with low adrenocortical function, the skin is darker, and some hepatitis patients, the face appears obscure or chloasma. Some young women may also have facial pigmentation due to physiological reasons such as ovarian dysfunction and menstrual disorders. Qi and blood stasis: Insufficient essence and blood, stagnation of Qi and blood, stagnation under the skin; or liver stagnation, stagnation of Qi, stagnation of heat, burning of Yin and blood, resulting in the loss of harmony of Qi and blood on the face; or due to spleen deficiency and dampness, dampness and heat accumulation, rising to the face, resulting in the formation of chloasma. Drug factor: Because women take oral contraceptive pills for a long time, 9%-20% of women are prone to chloasma. Regular use of drugs for hypertension and diabetes is also another reason for chloasma. In daily life, we should pay attention to the following: 1. Eat fruits and vegetables containing vitamin C every day, because vitamin C can not only inhibit the formation of melanin, but also have the effect of redox, and a large amount of vitamin C can make the darker oxidized pigment gradually revert to light color or even colorless. Foods rich in vitamin C are: lychee, longan, walnuts, watermelon, honey, pears, dates, leeks, spinach, oranges, radish, lotus root, winter melon, tomatoes, scallions, persimmons, loofah, bananas, cucumbers, etc. 2, containing highly photosensitive food, such as: celery, carrots, parsley is best to eat at night, do not eat in the sun after. To avoid melanin deposition. 3, pay attention to sun protection: pay attention to sun protection is not seasonal, you can’t see the sun during the day but there are ultraviolet rays; there is also environmental air pollution. 4, facial spots girls should pay attention to menstrual maintenance, eat more food to help the uterus in the discharge of stagnant blood.