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。

Leukoplakia is a precancerous white lesion, but more serious lesions include the red-colored erythroplakia which almost always contain severe dysplasia or early cancer.

口腔黏膜白斑是一种白色的癌前病变，但更严重的病变包括红色的口腔黏膜红斑，其几乎总有严重的异型增生或早期癌变。