I would still go to the dentist to have it looked at. You could have a cavity under the gum line where you can't see it. That's what happened to me. The cavity was under my gum line and I got a painless knot right above that tooth.
This could be something totally different but dentist's know about the whole mouth. You may have cut your gum on a piece of hard food and it caused an infection. Have it checked out and let me know how your doing. Take care. Remar
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