purple vitiligo

例句：

1. 1. The patient's skin was covered in purple vitiligo, making it difficult to see the underlying tissue.
   患者的皮肤覆盖着紫白癜风，使得难以看到下面的组织。
2. 2. The condition is often associated with a genetic predisposition and can be treated with topical creams.
   这种状况通常与遗传因素有关，可以通过外用药膏进行治疗。
3. 3. The patient's family history is significant as they have both parents with similar symptoms.
   患者的家族病史很重要，因为他们的父母都有类似的症状。