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。

Erythroplakias are more serious than leukoplakia because almost always when they are removed and examined under the microscope they will show severe dysplasia, or early cancer.

黏膜红斑要比黏膜白斑严重得多，因为在显微镜下观察这些组织时，它们几乎都表现出了明显的异型增生，或癌变早期征象。