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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.
Sore palate or sores on roof of mouth is a common condition and there are many reasons for it, from as common as eating hot and spicy food to may be some type of a boil around the palate region. This article gives an overview of what can cause sore palate or pain in the roof of the mouth and home remedies for it.