Mouth Sore on the Outside (ouch)!

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Around a week ago, I was eating some bread that had been heated. It had a rough edge and it pricked the outside corner of my mouth. It did not bleed or anything but a pinch was made. The next day, it had that look like a zit or canker sore and then as the days have progressed, it hurts like a canker sore. It could be worse. I could have had the sore within my mouth. But, it still is a pain. I will be glad when it is gone.