Hi, it may be a simple apthous ulcer also called as Apthous Stomatitis
. Please apply Mucopain and Hexigel ointments
alternatively 3-4 times a day. If the ulcer does not show signs of healing or bleeds profusely even after the application of ointments, please get a biopsy
done immediately to find out a clear diagnosis. Please do not delay the investigation. Chronic ulcers have a high pre-cancerous potential. Take care!