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Symptoms of mouth cancer. Mouth cancer can develop on most parts of the mouth, including the lips, gums and occasionally, the throat. The most common symptoms of mouth cancer include: red or white patches in the mouth or throat.
Less common types of mouth cancer include: 1  oral malignant melanoma â where the cancer starts in cells called melanocytes, which help give skin its colour. 2  adenocarcinomas â cancers that develop inside the salivary glands.