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妇女怀孕后,皮肤要发生很多生理变化,其中皮肤上的色素改变是最引人注目的。妊娠初期,由于血液中的雌激素增多,皮肤的黑素细胞活动增强,数目增多,皮肤色素增加,所以先从含黑色素数目较多的乳晕和乳头部位出现颜色加深,往往变成棕褐色或紫黑色。随着妊娠时间的推移,腹部的肚脐周围、腋下、外阴和肛门周围的皮肤皱折部位也会出现颜色加深现象。在分娩后其颜色就会逐渐减退并逐渐恢复到原来的肤色,但大多数仍然比怀孕前的肤色深。皮肤色素的变化一般发生在妊娠3～5个月之间,大多先在两侧面颊部、鼻梁处出现淡褐色或黄棕色的斑片,斑片的边缘与正常皮肤有清楚的分界线,多呈两侧对称分布,俗称“蝴蝶斑”,医学上称其为“妊娠黄褐斑”。这些皮肤的色素变化待分娩后随着体内雌激素
After a woman’s pregnancy, the skin undergoes many physiological changes, of which the pigment changes on the skin are most noticeable. Early pregnancy, due to increased blood estrogen, melatonin skin activity increased, the number increased, increased skin pigmentation, so first with a larger number of melanin and the nipple areola appear more dark spots, often become tan or purple black. With the passage of pregnancy, the abdomen around the navel, armpits, vulva and anus around the skin wrinkles will appear the phenomenon of color deepening. After childbirth, the color gradually diminishes and gradually regains its original color, but most of them are still darker than their pre-pregnancy skin color. Changes in skin pigmentation occurs generally between 3 and 5 months of pregnancy, most of the first in the cheeks on both sides of the nose or nose appear light brown or yellowish brown patches, the edge of the patch and the normal skin have a clear dividing line, and more Symmetrical on both sides of the distribution, commonly known as “butterfly spot”, medically referred to as “pregnancy melasma.” These skin pigmentation changes with estrogen after birth