Cold Sore, Canker sore or something else?

Patient : I recently woke up one morning to find a small pea size bump in the soft part of the roof of my mouth. It didnt hurt initially but I pushed and picked at it for two days. Then it disappeared, but left behind two small whitish spots that lingered for a few days more. They didnt hurt enough to interfere with eating or drinking but were slighlty tender. The reason I am concerned is because I performed oral sex the night before I had the bump. I have always gotten cold sores a few times per year, only always on my lips and always very painful. I have also had canker sores a time or two and they are very painful. Though this was not especially painful, I of course looked on the internet and found links to cold sores inside the mouth. I am concerned about this because I performed oral sex the night before the bump appeared. If it is a cold sore, then I am afraid I might have spread the infection. If my cold sores have always been painful, what are the chances that this was an almost painless cold sore, and in a different place than normal. I have no immunity problems that I am aware of.
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