I am a heavily tatted guy (both sleeves, both pecs, back, etc. I have considerably less body hair in those areas than I did when I was younger. I don’t know if the tattoo itself caused hair loss, or if it’s just unrelated and age related or some condition. But I went from a super hair dude to a mildly hair dude.
if you get a head tattoo then later on get an HT in that area, the tattoo would likely look a bit jacked after.