Thanks for asking the query,
Your clinical history and symptoms suggest that you are suffering from recurrent apthous ulcers.
This occurs due to many factors like immunologic abnormalities,iron, vitamin D, folic acid deficiency
, traumatic incidents like self inflicted bites,tooth brushing and dental trauma
Get thorough clinical examination done.
Apply 1.5% of cortisone acetate
topically over the affected area.
Take vitamin B suplements, avoid intake of hot and spicy food stuffs.
Use saline water gargles 3-4 times a day to give soothing effects.
Use antiseptic mouthwash solution like chlorhexidinewhich provides numbing effects, helps in faster healing and relieves pain.
Take balanced diet, include plenty of raw green leafy vegetables, carrots,salads, fruits like oranges, lemon.
Drink plenty of water and keep yourself hydrated.
Hope this helps out.