It may b apthus ulcer . Which is stress related.have mild food ..

Get ur vit12..folic acid...iron..zinc tested...avoid stress and spicy food

There can be many reasons for oral ulcers especially those which are recurrent and multiple. The exact diagnosis can be made after a proper clinical evaluation of the case and detail clinical history regarding your oral habits like tobacco usage or History of medications etc. Tentatively speaking, this could be aphthous ulcers which are most commonly precipitated by stress as well as other factors like hormonal changes or nutritional deficiency or physical or chemical trauma. They usually Heal within 7 to 10 days and for that duration you can use anaesthetic ointments like dologel CT for temporary symptomatic relief. Regards.