Thanks for asking the query,
Internal roughness and burning sensation of the mucosa can be due to vitamin deficiencies
I would advise you to apply antiseptic anesthetic
oral ointment topically over the inflammed area which provides numbing effects and helps in faster healing and reduces pain.
Use antiseptic mouthwash gargles twice daily that gives a soothing effect.
Start with a course of antioxidants
two times daily and analgesic
to relieve pain.
Hope this helps out.