Pubic hair is fine and curly, and doesn't grow hugely long.

I think it has different genes expressed in the follicles, it probably responds differently to testosterone etc.

I think the microbiome of pubic hair follicles would be altered when it's exposed on your head. Different environment would favor different microbiota.

Edit - unless you wear a sweaty hat all day long!

Pubic hair is fine and curly, and doesn't grow hugely long.

I think it has different genes expressed in the follicles, it probably responds differently to testosterone etc.

I think the microbiome of pubic hair follicles would be altered when it's exposed on your head. Different environment would favor different microbiota.