四川省读者成明其来信问:有的书上说,长期大范围的溃疡有可能是口腔癌的症状,请问是这样吗?专家:口腔溃疡是常见病,但又确确实实有癌变的可能。良性口腔溃疡是指不会癌变的口腔溃疡,恶性口腔溃疡则相反。那么如何来区分良性口腔溃疡和恶性口腔溃疡呢?首先以溃疡愈合时间来区分。良性口腔溃疡一般数天至数周可以愈合,而恶性口腔溃疡则呈进行性发展,数月甚至年余 Sichuan Province, the reader into a clear letter to ask: Some books said that long-term large-scale ulcers may be the symptoms of oral cancer, excuse me? Expert: Oral ulcers are common, but indeed there may be cancer . Benign oral ulcers are oral ulcers that do not develop cancerousness, whereas malignant oral ulcers do the opposite. So how to distinguish between benign and malignant oral ulcer? It first to distinguish between ulcer healing time. Normal oral ulcers can be cured for days to weeks, while malignant oral ulcers are progressively developed, months or even years