The darkening of the armpits during pregnancy is normal. The darkening of the armpits, as well as the darkening of the areola, the enlargement of the areola, and the black line on the belly below the navel are all related to the hormonal secretion in the body. After pregnancy, there will be an increase in estrogen and progesterone, which will lead to dryness of the body skin. Most pregnant women also have butterfly spots on the face, mainly on the forehead or cheeks. They should try to avoid direct exposure to ultraviolet light and eat more fresh fruits and vegetables, which can improve the body’s immunity, enhance skin elasticity and reduce pigmentation. This condition will gradually fade away after the baby is born.