Please consider that this could be lichen sclerosus (LS), a skin condition very little is known about, except that it 'may' have:
- autoimmune aspects, and/or
- Inherited/ genetic traits.
I think if you put my name/"handle" into the Mayo Clinic Connect search bar you may find my prior (& very recent) postings on my now "Vulvar Intrepithelial Neoplasia" (VIN) discovery, which is precancerous, with one possible spot that may be cancerous (another biopsy in a month for that).
Have followed my lichen sclerosus condition for about 40 yrs now, since my 1st gynecologist ID'd it.
Your gynecologist should be able to ID it, either upon exam &/or w/a biopsy. It is mostly found in women, though I've read men can have it too.
It can lead to vulvar cancer, in a minority of cases.
If ID'd as LS, Clobetasol propionate is the ointment most effective to calm it down.
LS is NOT any kind of STD.
Hope this may help you to find the proper medical care for the condition.
Best wishes...