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Mouth ulcers are tiny breaks in the lining of the mouth or on the tongue that form painful flat sores. Theyâre thought to be caused by a virus. They mainly occur when your child has been ill or tired, as well as during stressful times. These types of ulcers are often referred to as âaphthous ulcersâ or âcanker soresâ.
Types of mouth ulcer. The main types of mouth ulcer are: 1  Minor ulcers. 2  These are around 2-8mm in diameter and usually clear up in 10 days to 2 weeks. 3  Major ulcers. 4  These are bigger and deeper, often with a raised or irregular border. 5  This type of ulcer can take several weeks to heal and may leave a scar in the mouth. These are around 2-8mm in diameter and usually clear up in 10 days to 2 weeks. 2  Major ulcers. 3  These are bigger and deeper, often with a raised or irregular border. 4  This type of ulcer can take several weeks to heal and may leave a scar in the mouth.