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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.
Mouth ulcers can sometimes be caused by certain medical conditions, such as: 1  viral infections â including the cold sore virus, chickenpox, and hand, foot and mouth disease. 2  vitamin B12 or iron deficiency. 3  Crohn's disease â a long-term condition that causes inflammation of the lining of the digestive system.