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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.
Symptoms caused by salivary gland cancer also may be caused by other conditions. 1  A lump (usually painless) in the area of the ear, cheek, jaw, lip, or inside the mouth. 2  Fluid draining from the ear. 3  Trouble swallowing or opening the mouth widely.  Numbness or weakness in the face.