Whoever posted the trypophobia stuff, I think trypophobia is kind of misrepresented.
I mean since trypophobia is de facto the fear of many tiny holes,
People who are trypophobic should be afraid of them in general, I'm aware of that.
But for most of us, we're mostly disturbed with people having holes with stuff in them, or very bumpy skin (making it not really a hole),
because it is not expected for people to have that, while the pictures that don't involve people don't scare us.
We would be scared too if the sun somehow went out, or things are suddenly not what they seem to be, like animatronics that move without being controlled by anything.
Basically the pictures of "people with holes" is the fear of the uncanny valley, as it implies here as well as the robots.
Yes, having holes in your arms is disturbing, but so is mutilation to the body in general, because it is simply "off" and "odd" and "strange"
and even "creepy" or "horrifying".
"Why" is probably another matter, probably due to parasites borrowing in the body, like maggots.
Makes sense, right?