Hi thanks for asking question.. Here you could have acute stomatitis like condition or ulcer.... Take rabeprazole for few days ... Drink more water... Take soft and bland diet for few days. More fruits with avoidence of smoking and alcohol. Avoid excess tea and coffee.... Cooked oatmeal good ... If you develop diarrhea then treat as gastroenteritis with antibiotic..... USG also done..... If still cause not clear endoscopy done ... I hope your concern solved... Take Care.... Dr.Parth Goswami