Relief for urination- I have had vaginal aphthous ulcer for about a week now. Last time it happened was 10 years ago an I remember it being so painful. List of 48 causes for Aphthous Ulcer and Vaginal swelling, alternative diagnoses, rare causes, misdiagnoses, patient stories, and much more. Aphthous stomatitis is a common condition characterized by the repeated formation of benign and non-contagious mouth ulcers (aphthae) in otherwise healthy individuals. The informal term canker sores is also used, mainly in North America, although this may also refer to any mouth ulcer.