Aphthous ulcers (aphthae, recurrent aphthous stomatitis or canker sores). Aphthous ulcers occur at some time in 1 in 5 people, most commonly in teenagers and young adults. They are areas of round or oval skin loss on the inner wet surfaces of the mouth or genitalia, such as inside the lips, cheeks or under the tongue. Most aphthous ulcers are recurrent minor aphthous ulcer (recurrent aphthous stomatitis). The cause is unknown but may include stress, injury to the skin, vitamin and mineral deficiency and vary with periods. Sometimes they run in families.
They may rarely be associated with some illnesses that affect the immune response, including Behcet disease, HIV/AIDS, Coeliac disease and inflammatory bowel disease.
Do I need any tests?