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What are canker sores? Canker sores (also called aphthous ulcers) are different than fever blisters. They are small, red or white, shallow ulcers occurring on the tongue, soft palate, or inside the lips and cheeks; they do not occur in the roof of the mouth or the gums. They are quite painful, and usually last 5-10 days.
Canker Sores. 1  develop on the soft tissues inside the cheeks or lips, underneath the tongue or at the base of the gums. 2  arenât contagious. 3  are round with a white or yellow center and a red border. 4  generally heal within one to two weeks. 5  caused by immune-suppressing viruses, autoimmune disorders and auto-inflammatory disorders.