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There are many types and causes of mouth sores. Mouth sores may be caused by an infection, a bodywide (systemic) disease, a physical or chemical irritant, or an allergic reaction (see Table: Some Causes of Mouth Sores). Often the cause is unknown.
Trauma-related cuts become inflamed, swell, and have the potential develop into a mouth ulcer. Ill-fitting dentures may also cause sores and mouth redness. Any type of trauma to the mouth, lips or tongue can also result in mouth redness as a result of inflammation and swelling around the site of injury.amaged to the mouth from hot or spicy foods, chewing tobacco or smoking can cause mouth ulcers. Mouth ulcers may also result from specific medications, including chemotherapy.