melasma gravidarum

例句：

1. 1. The woman's melasma was a result of her pregnancy.
   这位妇女的妊娠斑是怀孕的结果。
2. 2.The doctor advised the patient to avoid sun exposure for the safety of their melasma.
   医生建议病人避免阳光照射，以免加重他们的妊娠斑。
3. 3. The melasma on her face had become more noticeable since she became pregnant.
   自从她怀孕后，脸上的妊娠斑变得更加明显了。