The phoboa or natural ingrained phobia that it seems everyone has.
To put it shortly it seems a long time ago our collective ancestors saw folks skin rotting cuz of a worm and everyone went
" NAH B "
and that shit is ingrained in our DNA
We are trying to scratch the worms out of our skin. I'm assuming our brains aren't registering it is a picture, of a picture but its seeing the thing and the lizard part of the brain is going
" OH SHIT WORMS, HE HAS WORMS. WORMS IN THE AREA SCRATCH THAT SHIT OUT OF YOUR SKIN SON "