口腔粘膜白斑可发生于唇、舌、牙龈、口颊、口底、硬腭和软腭等部位。当这些增位的白斑较长期存在时,有少数可发生癌,故口腔粘膜白斑被认为是一种癌前病变。通过对粘膜白斑治疗可达到预防和发现早期口腔癌。 定义:所谓白斑是指粘膜发生白色斑块或增厚。在显微镜下表现为上皮过度角化,包括角化上皮增厚角化不全和颗粒层细胞增殖。但是白斑不能算是一种独立的疾病。 Oral mucosal leukoplakia can occur on the lips, tongue, gums, cheeks, mouth bottom, hard palate, and soft palate. When these increased white spots are present for a longer period of time, a small number of cancers may occur, so oral leukoplakia is considered to be a precancerous lesion. By preventing leukoplakia, prevention and early oral cancer can be achieved. Definition: The so-called white spot refers to the occurrence of white patches or thickening of the mucous membranes. Under the microscope, epithelial hyperkeratosis was observed, including hyperkeratosis in keratinized epithelium and granular cell proliferation. However, white spot cannot be considered as an independent disease.