Don't see it as proud flesh
There is no granulation of the tissue. It's just an open sore. We clean it and treat it twice daily. There is no pocket of pus. He's been treated twice for infection prevention, and I don't like over use of antibiotics. Of course I could go buy another bottle, but don't think it's indicated. He feels great, eats well, no lethargy at all.
When I got him, the very inner corner of the mouth was where the tear was, and now the open part of the wound has migrated to the exterior area. I can use the silver nitrate sticks to cauterize it again, but am not a fan, although I read it's very successful on human canker sores.
No, it's not in my budget to have the vet out, and also I worked as a vet tech for several different vets in the past, and feel fairly competent to deal with most issues.