黄褐斑 黄褐班又称肝斑,是一种面部发生黄褐色或黑暗色斑片为特征的皮肤损害。斑片表面光滑无应屑,既不痛也不痒,常见于面颊、鼻两侧及前额下部,形态多不规则,但左右分布对称,有时形似蝴蝶,故也称蝴蝶斑。黄褐斑的色泽随季节而变化,一般冬季变浅夏季加深,此病多发生于中青年妇女,以青春期、妊娠期妇女更多。 Chloasma also known as brown patches of brown spots, is a facial brown or dark patches of skin lesions characterized by color. Plaque surface smooth without crumbs, neither pain nor itch, common in the cheeks, both sides of the nose and lower forehead, irregular shape, but about symmetrical distribution, sometimes shaped like a butterfly, it is also known as butterfly spot. Chloasma color changes with the seasons, the general shallow deepening winter deepened, the disease occurs mostly in young women, with adolescence, more women during pregnancy.