Welcome to HCM
Your symptoms are suggestive of simple ulcer in the mouth known as ulcer.
Causes include physical trauma, stress, lack of sleep, food allergies, deficiencies in vitamin B12
, iron, and folic acid
I advice you to take multi vitamin tablet and use any anesthetic
jelly if pain is present. It will usually resolve on its own when the precipitating factors are removed.
Mean while i advice you avoid spicy foods, smoking
and alcohol if any, salt water gargling will be helpful.
I hope i have provided the information you needed.