Is this a canker sore?

sara

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About an hour and a half ago I tasted something metallic on the roof of my mouth.
It was a bit uncomfortable where the taste was coming from.

Now an hour and a half later I've got a bump there, I can feel it with my tongue.
It doesn't hurt anymore, but I find it pretty impressive how fast it came about.

So does it sound like a canker sore?
 
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