| SYMPTOMS
- Small, painful, craterlike ulcers that appear singly or in clusters on the inside of the mouth, usually lasting 5 to 10 days. The sores are grayish white or pale yellow with red borders; they may occur on the inside of the cheeks and lips, on the tongue, at the base of the gums, or on the soft palate.
- Tingling or burning in the mouth; this sensation often occurs 6 to 24 hours before sores appear.
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