Almost looks like water damage but that is either a lot of water pressure or a long amount of exposure…
No idea what they are but I imagine bullets would do a lot more damage to brick than that. And there a strange pattern that doesn't make sense for bullets.
this is very infuriating for people with trypophobia, really hope I could figure out how to hide this …
Oh please stop with these ridiculous made-up conditions, "trypophobia" is not a real disorder.
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.
It was a vertical section of brick. Just off screen to the left the bricks are completely normal and to the right is a window.
The real question is "Are they like that all the way through, and if so, how much, precisely, would that affect the strength and insulation as compared to 3 hole red brick?".
Yes, i know bricks have a different amount of holes depending on where they're made already, don't go there, it's settled.