Lol! It's from martial arts training. We were pressure testing partner knife drills last night.
The thumb-side wrist marks are primarily from my partner blocking low-line sewing machine-style stabs.
The palm-adjacent one is from me blocking the same stabs from him.
The outside wrist mark was from my partner holding my wrist while transitioning to a hammerlock.
I can't remember what the ones higher forearm are from. It happens.
It's fun though. 😂