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Canker sores may also occur because of certain conditions and diseases, such as: 1  Celiac disease, a serious intestinal disorder caused by a sensitivity to gluten, a protein found in most grains. 2  Inflammatory bowel diseases, such as Crohn's disease and ulcerative colitis.
Herpetiform canker sores are uncommon and usually develop later in life, but they're not caused by herpes virus infection. These canker sores: 1  Are pinpoint size. 2  Often occur in clusters of 10 to 100 sores, but may merge into one large ulcer.