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Hi, this is Dr Ansari. Welcome to JA
This is completely normal. Just gargle with an antiseptic solution.
some times Palatal (roof of the mouth) roughness and under the tongue could be due to minor salivary gland infection, petechiae, Pharyngitis, allergy to particular food stuff, any tooth infection draining there, and also due to some habits like habitual smoking etc. Simple mouth hygiene and gargles may relieve the symptoms.
No its not cancer
You are most welcome.