It doesn’t sound like, from what you have posted, that typing was done of the lesion (HSV 1 or HSV 2). Or perhaps you just didn’t post that part for me? If you actually did have a typed swab test, that is quite definitive. So we know you have HSV, we just might not know which type.
I think you can start with the traditional HSV 1 and 2 type specific IgG antibody test. If the HSV 2 is positive, you can stop there. If it is negative, then we need to consider HSV 1 as the cause and the IgG for HSV 1 is not terrific. How about if you go ahead and do the screening test and let me know the results and we can work on understanding them together.