This condition is called mouth ulcer or apthae. Apthae can be there due to several reasons, like indigestion, constipation, deficiency of vitamin b12. Generally, this can be cured, just by few managing steps, like taking easily digestive food, take food, eat at least one papaya daily, avoid spicy, fatty, oily food, and taking b-complex capsules. If then also this doesn't cure in 10 days please consult.
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