I think it's related to trypophobia, which is fear of patterns of holes and bumps. It's tied into your ability to perceive disease and the disgust is your body's avoidance mechanism so you don't go near.

https://en.m.wikipedia.org/wiki/Trypophobia

There is a singular image of a plant so that link shouldnt be too triggering as it doesn't show images of comparable flesh (at least on mobile).

I know right? I can't quite put my finger on why, but it gives me "Fault of Amigara" vibes

Dude for real. This disturbs me for the life of this tree.

Yeah this vieny shit and trypophobia gets me. This is less bad, but once I was spray painting in the cold and it dried wierd and veiny. Grossed me out.

Fourpophobia