You mention that you were diagnosed with HSV 2 (and you mention the type specifically) 20 years ago. Do you know how the type specific diagnosis was made? Was it a swab test and are you pretty certain it was typed? Have you symptoms of recurrent herpes over the years since then?
I think it is very unlikely that the sore you describe was HSV 2. it sounds a lot more like a canker sore to me. I’m not saying it isn’t possible but it is unlikely. Once a person has an infection in one location (your genitals) it is very unlikely that you would acquire infection at a new location on the body. So what I’m saying is that if your antibody test is positive for HSV 2 (which I would expect it to be if you actually had a type specific swab done at your original visit), you should assume it is from your genital infection diagnosed years ago.
The test may well be negative for HSV 1 because the sore in your mouth does not sound like herpes. Also, the traditional herpes screening test missed 1-2 out of 10 infections with hSV 1. So not great for that.
Does that help? I could be missing the point here.
You’ve got two more questions to ask me so feel free.
Terri