Red, painful, fluid-filled blister that appears near the mouth and lips; affected area will often tingle or burn before the sore is visible and outbreaks may also be accompanied by mild, flu-like symptoms such as low fever, body aches, and swollen lymph nodes are some of the signs of onset of mouth sores. In most cases, mouth sores cause some redness and pain, especially when eating and drinking. They can also cause a burning or tingling sensation around the sore. Depending on the size, severity, and location of the sores in your mouth, they can make it difficult to eat, drink, swallow, talk, or breathe. The sores may also develop blisters.
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