Red circle on roof of mouth. Been there for a week and a half. No pain either

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I haven’t drank in 6 months and I don’t smoke. I can’t tell if this is a canker sore or burn related. I just recall I noticed the spot after eating hot soup

Hmm. Well to me it doesn’t look like a canker sore because canker sores usually have a bit of yellowish color in the middle.