Don‘t mess with shingles. Many years ago I had some sort of strange sore just above my hairline. Then a sore appeared on my forehead. I went to see my doctor but ended up seeing a student doctor (as my doctor’s practice was a teaching practice). He had no idea what I had but got a scalpel and took a sample of the sore to send to pathology. I can’t recall what happened exactly (it was a while ago) but I ended up going back to the doctor - and saw the same student again! He was out of his depth, but to his credit he knew that. So he said he’d get someone else to check. Off he went and he came back with my regular doctor. My regular GP took one look at me and said ‘he has got shingles’. He then pointed out the signs - the sores were only on one side of my face, and they followed the lines of the nerves. It then got a bit frightening. We had already lost time so the antivirals would be touch and go, and it was getting close to my eye. There was some concern that I could lose sight in one eye. It all came good in the end, but I still have the scars to show.
I appreciate your wife is happy to soldier on without medical assistance, and that’s her choice. Personally, if I were you (and knowing what I now know), I’d be going to my gp and seek their guidance. Most of the time shingles will resolve itself without any lasting impacts, but sometimes it can go really bad.