The exact cause of lip cancer is unknown, but several factors such as smoking and alcohol are associated with development.
Squamous cell carcinoma cells covering the upper lip, and the cells are most likely to develop in the lip, although the lip can also be caused by other types of cells present in the region. In rare cases, cells from other parts of the body travel to the lip. While these cancers occur on the lips, they are not considered cancer of the lips, but they are considered the primary cancer metastasis.
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