Hello there ,
Thanks for writing your query,
Appearance of white lines or scars on the cheek mucosa indicates inflammation may be due to chronic cheek biting , Ulceration due to truama or fungal infections like oral CAndidiasis
exact diagnosis can be made only after clinical examination and evaluation by a dentist
It may be caused due to several reasons like deficiency or certain vitamins especially vitamin B12 and vitamin C.
Maintain good oral hygiene
by practicing regular mouth rinsing with lukewarm saline water or antiseptic mouthwash like betadine or chlorhexidine
start with multivitamin supplements for 7 to 10 days and vitamin C lozenges will help in resolving the problem.
avoid alcohol , carbonated drinks , tobacco chewing
and smoking as these may worsen the area affected.
Apply oral antiseptic ,analgesic ointments like dentogel or mucogel topically over the affected area.
i hope this helps,