I’m so sorry you’re going through this, how awful.
I have lichen planus, which presented as a weird lesion like a big, deep paper cut. When I first went to the GUM clinic they said it could be herpes ‘but it doesn’t look herpetic’, like it was a bit of a guessing game because it wasn’t a typical presentation. They also gave me antiviral treatment for herpes which did seem to help, though it’s hard to say if it was just a more minor LP flare anyway.
They do their best to work out what it is but I needed a couple more referrals before I was diagnosed. Even the consultant who diagnosed LP, an expert in blistering conditions iirc, said she was not guessing exactly 😀 but taking a view based on not very much evidence.
My swab was negative, a biopsy showed inflammation but nothing else, no one really could say 100%.
This is all to say that you may need more time to get a definitive diagnosis and as a PP said if it is herpes it’s notoriously unpredictable, popping up in weird ways when you least expect it. So don’t rush to conclusions just yet.
My flares eventually stopped and I haven’t had one in years. I hope you feel better soon.