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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.
The sore on the top of the mouth could be caused by a canker sore. According to the American Academy of Otolaryngology, canker sores on the top of the mouth only appear on the soft palate, not on the hard palate.7 You can also get canker sores on the tongue or inside the lips or cheeks.