Uh...actinic keratosis is, uh, a premalignant lesion.

光线性角化 呃 一种癌前。

However, most lip vermillion cancers result from chronic sun damage and are associated with actinic cheilitis, a precancerous rough patch on the lip.

但，多数癌由慢性日光损害导致且和日晒性炎（即嘴上出现癌前粗糙斑块）有关。