Similar to canker sores, celiac mouth sores mainly consist of white, blister-like bumps on the tongue, inner cheek, or behind the lips. The lesions appear here because the mouth is a soft tissue area that can become infected when the immune system damages the intestine. Mouth sores often take a long time to heal because the mouth is always moist and the teeth and tongue easily irritate the area. When the sores are open, weeping, or bloody, this can make eating and drinking difficult.

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