Armpit skin tags also seem to be related to some HPV strains: https://en.wikipedia.org/wiki/Skin_tag

But they are not HPV16/18 and so not covered by this vaccine.

I successfully treated a persistent hand / feet / knee warts infection with 3 shots of Gardasil-9. The common warts are supposed to clear on their own within 2 years, but it was not the case for me. They all cleared out about a 1 year after the first shot, never to return. Including a deep plantar one that was completely immune to cryotherapy

https://www.sciencedirect.com/science/article/pii/S277270762...

There is some clinical evidence of other strain effect. See pediatric dermatology article from a year or two ago.