It depends: Sores or ulcers or any localized abnormalities inside the mouth can arise from number of causes. Canker or aphtous stomatitis could happen due to excessive stress or during immune status changes or as side effects to some medications, or vitamin b, zinc, follic acid or iron deficiencies..Also due to trauma or any source of irritation.Or could happen with certain systemic diseases.I.E lupus erythema.
Answered 9/19/2018
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