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Mouth ulcers
Mouth ulcers, also known as aphthous ulcers or canker sores, are small, painful lesions that develop on the mucous membranes inside the mouth, including the inner cheeks, gums, tongue, and lips. Mouth ulcers are common and can vary in size and severity. While they are usually harmless and resolve on their own within 1 to 2 weeks, they can be uncomfortable and may interfere with eating, drinking, and speaking.