Pregnant skin darkening may be related to factors such as increased hormone levels in the body, prolonged exposure to sunlight, and diseases. 1. Elevated hormone levels: pregnant women after pregnancy, usually have the phenomenon of rising hormone levels in the body, because the endocrine hormones during pregnancy is not very stable, may affect the metabolism of melanocytes due to hormonal reasons, so there will be skin melanin deposits, manifested as skin darkening. 2. Prolonged exposure to sunlight: pregnant women in pregnancy, if you do not pay attention to sunscreen, this may be due to prolonged sun exposure, ultraviolet radiation directly on the skin of pregnant women, causing subcutaneous melanin aggregation and deposition, so there will be symptoms of skin darkening. 3. Disease factors: some pregnant women during pregnancy, may be due to liver and kidney failure, resulting in the body’s metabolites and toxins accumulate for a long time, can not be discharged from the body, will cause the accumulation of waste, causing skin darkening. Pregnant skin darkening should go to the dermatologist to identify the cause of the disease and follow the doctor’s instructions, and then do the corresponding treatment and therapy.