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Canker Sores Canker sores (recurrent aphthous stomatitis, RAS) are among the most common of oral conditions and are experienced by more than half of the population. These small, round or oval, painful yellowish sores often first appear in adolescence. They usually affect the softer parts of the mouth that move, such as the tongue, soft palate, cheeks, and lips. This condition is recurrent because these sores usually will heal on their own but then reappear in the same or new locations after a period of time. In some severe cases, old ulcers may be healing while new ones appear. There are three main forms: Minor Aphthous Stomatitis: this is the form that affects more than 80% of canker sore sufferers. The sores are usually small (less than 1 centimeter in diameter), heal in about a week, and do not cause scarring. Major Aphthous Stomatitis: this more severe form affects approximately 15% of patients with canker sores. These sores often last two weeks or more and are typically over 1 centimeter in diameter. They can be extremely painful and often heal with scarring. Herpetiform Aphthous Stomatitis: This form of the condition is uncommon, occurring in less than 5% of people with canker sores. They occur as clusters of very small ulcers (less than a millimeter in some cases) that sometimes merge together to form larger ulcers. They usually heal in just over one week. Most of the time, canker sores are self-limiting. This means that they will go away even without treatment. The cause of canker sores is not known. However, in some instances, they can be a sign of other conditions affecting the body (such as a gastrointestinal disease). Be sure to tell your doctor if you are experiencing fatigue, abdominal pain, fever, eye discomfort, or have rashes or sores on other parts of your body. 1/2 Canker Sores A Typical Aphthous Ulceration More Extensive Major Ulcerations QUESTIONS AND ANSWERS ABOUT CANKER SORES Q: Is the condition contagious? Did Iassociated catch it and can Ipain, give itconnections to anyone else? A: No. This condition is not like herpes and cannot befrom transmitted, even you have open sores. the difference? biopsy The to location be certain. is aof good clue. Your doctor may recommend performing culture orwithout a diet, Then what causes canker sores? causes they mouthwash. 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