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Does it have the appearance of a bit mark?
Does his tongue have any abnormal lesions or growths?
The concern would be that he might have cancer of the tongue.
The altenatives would be infections, ulcers, inflammatory disease like lupus, or vitamin deficiencies. If it was me, I would go see a doctor and get a full complete blood work done to make sure I do not have any underlying diseases such as metabolic, endocrine, or electrolyte abnormalities. I would also be screened for vitamin deficiencies which often appear as mouth lesions. Rarely people can get cancers of mouth. Cancers are more common with smokers, alcoholics, and prolong infections. With your blood work, you should also have screening for inflammatory markers for lupus and other common inflammatory diseases.
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