26 y/o Had these for probably 7 months now. Was sexually active without condoms with my ex of 4.5 years, and only her. Randomly popped up ~ 4 years into relationship. I also PPP, but thats not the issue.
I think the suggestions you make are in the right area, that these are natural growths rather than anything to be too concerned about. The only people that would tell you for sure are a Urologist or Dermatologist dealing with genital skin issues …