Thanks for asking the query,
Due to physical trauma caused to the cheek mucosa at the time of eating had developed redness
, inflammation and ulceration of the cheek mucosa.
It can also be due to allergy
to some food products.
Apply topical mucopain and Dologel oral ointment over the affected area.
Go for symptomatic treatment like lukewarm saline gargles,
Use antiseptic mouthwash gargles this gives soothing affect.
Hope this helps out.