Sore above right canine tooth, appeared a year after tooth extraction. started out as a cranker sore and now is red and and inflamed no pain. its been a month and it has not gone away went to the dentist and said that nothings wrong should i worry?

Any lesion that has not resolved on its own in two weeks should be further investigated. Please see an oral surgeon for further examination.

Was an x-ray taken? It could be a piece of bone that became loose or you could have irritated the area by biting on a sharp bone or nut. Keep looking at the area and get an x-ray if one wasn't done.

Standard of Care is that any lesion lasting longer than 2 weeks deserves investigation. You were right to see a Dentist. As (S)he found nothing of concern, it would now be prudent to have further investigation done by an Oral Surgeon. Therehasn to be an explanation, a cause for the lesion.