The time of spot growth after pregnancy varies from person to person, some pregnant women start to grow spots in the middle of pregnancy, while some pregnant women do not grow spots during the whole pregnancy. The spot growth during pregnancy may be related to the rise of estrogen and progesterone. Estrogen promotes melanocytes to secrete melanosomes and progesterone speeds up the operation of melanosomes, both of which work together to produce melanin, leading to local melanin deposition, which eventually leads to spots. However, due to individual differences, the degree and duration of spots on pregnant women vary from person to person, most of them will disappear on their own after delivery, but some of them will remain permanently. In conclusion, spots during pregnancy usually do not require special treatment, but if necessary, seek the help of an obstetrician-gynecologist or dermatologist to treat them with topical medication. It is recommended that women pay attention to sun protection during pregnancy to avoid UV damage to the skin, consume more fresh fruits and vegetables, especially those rich in vitamin C, drink more water and consume less spicy food.