Red lesions are different from canker sores. Canker sores subside in a maximum of two weeks. Cancer-associated lesions are red bumpy patches on the tongue that don't go away on their own. In the early stages, such lesions may not hurt, but if they persist for more than two weeks, you should have them checked by a doctor. Most oral cancers tend to affect smokers, although the HPV virus can also be a cause.

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