Signs of precancerous development include areas of leukoplakia, erythroplakia, erythroleukoplakia or any other abnormal appearing tissue or masses.

癌前征象包括口腔黏膜白斑、红斑、红白斑或出现其它不正常的组织或肿块。

And as cells become more and more dysplastic the lesions sometimes develop red spots, and at that point it's called erythroleukoplakia.

随着细胞异型增生的程度越来越高，这些病损（白斑）上可出现红色的点，此时我们把它称作红白班。