Almost looks like water damage but that is either a lot of water pressure or a long amount of exposure…

This image is not safe for people suffering from trypophobia

A person made these marks, they all kind of focused towards a center line, overall. Maybe a rock hammer? Is especially obvious on the bottom third of the picture with the arcs in the patterns.

This should be on “Mildly Irritating” because it’s a vertical, rather than horizontal, pic, which means I can’t make it my wallpaper.