I'm fairly hairless as well. Not sure if it's a thyroid thing or not. I have zero armpit hair and very little leg hair.
I have found that my Cholesterol levels increase when my labs are not optimal - meaning they go hypo. I have labs to prove it.My cholesterol is up a little which some people say is fine others not. I see it as a sign I probably don't have enough T3 getting into my cells.