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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 however occur only inside the mouth on the tongue and the inside linings of the cheeks lips and throat fever blisters also called cold sores usually occur outside the mouth on the lips chin cheeks or in the nostrilsanker sores however occur only inside the mouth on the tongue and the inside linings of the cheeks lips and throat fever blisters also called cold sores usually occur outside the mouth on the lips chin cheeks or in the nostrils