1. Why does pregnancy cause melasma? Melasma, also known as pregnancy spot and liver spot, will be jointly induced by the change of estrogen during pregnancy and the stimulation of progesterone. Not only is it easy to grow chloasma when pregnant, endocrine disorders caused by irregular life, certain chronic diseases, trace elements, insomnia and hereditary factors may all lead to the formation and aggravation of chloasma. 2. After pregnancy, chloasma grows on the face, will it disappear by itself? Chloasma is a light brown color spot with unclear boundary and variable shape that appears on the facial skin centered on the cheekbone. Pregnancy and sun exposure can worsen the lesion, which is a common phenomenon of facial discoloration, and its symptoms will change over time. It is difficult for melasma to disappear by itself without treatment. 3. I heard that melasma is very difficult to treat, is it true? It is true that melasma requires more time and patience for treatment than other color spots because of its active pigmentation and more influencing factors. However, chloasma is treatable, which is indisputable, and I hope friends must have confidence in treatment. 4. How to treat melasma? In addition to taking oral medicine, maintaining a normal and healthy diet and keeping a relaxed mood, one should also cooperate with laser treatment to get rid of melasma. Due to the special nature of melasma which is manifested as abnormal activity of melanocytes in pathophysiology, laser or intense pulse light should minimize the stimulation to melanocytes when treating melasma to avoid aggravation of melasma. Therefore, only the melanin particles within or between melanocytes are targeted for selective light bursting in energy selection, which inactivates or inhibits the function of melanocytes through low energy and multiple light bursting effects. It can not only improve the epidermal pigment, but also correct the skin vascular abnormality and inflammation, which is again favorable for chloasma treatment. 5.Is melasma easy to recur after treatment? All the pigmentation spots have the possibility of regeneration if you do not pay attention to sun protection and follow the doctor’s advice after treatment. We hope that we can keep good skincare habits, so that good skin will naturally be possessed for a long time. 6.What should we do to cooperate with the treatment? (1) Take care to supplement some vitamins in your daily life. For example, eat more vitamin-rich foods, such as tomatoes, cucumbers, carrots, barley, milk, beans, etc., fruits such as citrus, strawberries, fresh peaches, hawthorn and so on. (2) Avoid stimulating foods. For example, spicy food, coffee, cola, strong tea, etc. Quit bad habits such as smoking, drinking, staying up late. (3) Combine with medication if necessary. Use hydroquinone cream or retinoid cream externally, and at the same time, it can be adjusted with some traditional Chinese medicines that soothe the liver, tonify the kidneys, invigorate the blood, and benefit the qi. (4) Pay attention to sun protection to keep the skin barrier from being damaged.