When I got super stressed, especially with video games, I would let my anger flow and break things.
During the pandemic, I got super bad with my tolerance to anger/anxiety and starting having fits again, except with myself.
I would bite hard the top of my right hand's wrist. Multiple times.
My skin was brown because of the constant scarring. It also became thick.
I only stopped recently. Trying to hide bite marks or dismissing them as a "blemish" with then-coworkers was awkward.
Now the skin mostly went back to its original color, but it's still thicker than the other wrist.