Hi Dear, Welcome to HCM. Understanding your concern. Thanks for your query. The most probable cause for the symptoms you mention is aphthous ulcer . There can be many reasons for occurrence of aphthous ulcer , but in your case it seems to me that mechanical trauma is the most probable reason for ulcers . The other reasons are stress . vitamin deficiency and irritation of mucosa due to certain medications . Aphthous ulcers go away in week by itself . I would suggest you to :- - Try to relax your self . - Apply orabase gel that contain benzocaine. - Do antiseptic mouthwash rinses. If condition doesn t get better in a week then consult dentist or oral pathologist for proper examination tto rule out condition like herpes or allergy. Doctor may prescribe topical tetracycline , topical steroids or anti viral drugs depending upon the diagnosis . Hope your concern has been resolved. Best Wishes, Dr. Harry Maheshwari