Thanks for your query, I have gone through your query. The mouth ulcers on the oral mucosa could be aphthous ulcers secondary to the stress or medicines. Nothing to be panic, consult a oral physician and get it evaluated. If it is a aphthous ulcer then you can take topical anesthetic and analgesics like anabel gel. apply 3-4 times daily before food and topical steroid like triamcinolone acetonide 0.1% 4-5times daily after food. Do saline gargling. If the lesion does not heal in 5-7 days then consult a oral physician and get it examined. I hope my answer will help you, take care.