Dark spots on the face after pregnancy may be due to the appearance of chloasma or sun spots. 1. Melasma: During pregnancy, due to the increased secretion of estrogen as well as progesterone in the body, women stimulate melanocytes to secrete melanin particles, and at the same time are able to promote the transit and spread of melanin particles, which ultimately form hyperpigmentation spots on the face. Ultraviolet radiation is also an important factor for the occurrence and aggravation of chloasma. 2. Sun spots: When sunlight dermatitis occurs after a long time of exposure to ultraviolet rays, the inflammatory reaction can make the skin surface prone to pigmentation, which is called sun spots. Chloasma that appears during pregnancy may change as the woman gives birth and the hormone level in her body gradually returns to normal. Sun spots can also be improved by sunscreen treatment. For dark spots that do not fade away for a long time, it is necessary to go to the dermatology department of a regular hospital for a professional doctor’s consultation in time.