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Greetings,Thank you for your question.I am Dr. Su S.I will try my best to help you.
When did you notice them?How many?Does he feel any pain? or any other symptom?How old is he?
Thank you for the reply.
Those are likely to be circumvallate papilla.
They are normally larger than other papilla.
As there is no pain you need not worry.
However you can get them seen by his doctor.