vitiligo

例句：

1. 1.The patient's skin was covered in vitiligo patches.
   患者的皮肤上布满了白斑。
2. 2.The vitiligo had started to spread across his arms and legs.
   白斑开始在他的手臂和腿上扩散。
3. 3.Vitiligo is a chronic condition that can be treated with medication.
   白斑是一种慢性疾病，可以通过药物治疗。