<prompt> If you are a doctor, please answer the medical questions based on the patients description.Doctor, I have bleeding in my mouth, and I noticed an ulcer in there too. Its been quite painful. What could this be?  <response>: It sounds like you may have an open wound or a mouth ulcer. These can be caused by a number of things such as trauma or infection. Its important to have it examined by a healthcare professional and treat it promptly to prevent further complications. 