@heisenberg34 I had a bout of what sounds similar a while back and it had an odor so I figured it was an yeast infection. I just started cleaning it many times a day and changed my underwear also. it worked and haven't had it come back yet, that was in May 2023.
I had a tube of cream I got while I was in the Hospital at Mayo when I had c-diff and they gave me this for a similar area problem. Its called Aloe Vesta Protective Ointment 3 and its for minor skin irritations. Its also used for diaper rash which is somewhat similar. I don't know if its available OTC but Im figuring something similar may be available. Well anyway it helped and in just a few days it was gone. Not sure if your situation is similar but who knows what might work. I hope you find a solution.