1、Chloasma is a common skin condition characterized by the appearance of brown patches on the face.
黄褐斑是一种常见的皮肤病，其特征是面部出现褐色斑块。
2、Exposure to sunlight can worsen chloasma and make the patches more noticeable.
暴露在阳光下会加重黄褐斑，并使斑块更加明显。