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Oral cancer symptoms. Some of the most common oral cancer symptoms and signs include: 1  Persistent mouth sore: A sore in the mouth that does not heal is the most common symptom of oral cancer. 2  Pain: Persistent mouth pain is another common oral cancer sign.  A lump or thickening in the cheek.
Look Further in Detail. The following are some mouth cancer pictures that can help you in knowing what does mouth cancer look like. 1. Leukoplakia (White and Hardened Patches). Squamous Cells is the name given to the flat cells that are present on the surface of the tongue, mouth and lips.he following are some characteristic features of how mouth cancers look for people wondering what does mouth cancer look like. 1  An ulcer that starts bleeding when touched, having rolled edges and a crater in the centre.