Sometimes scratching just isn't cutting it, and the human brain is...well it's something and it tells me bite the itch cause teeth are stronger and you try and it doesn't help.
Understanding isn't necessary. The call to bite is there and it somehow works, so you don't question it. I don't grind me teeth to mimic scratching - just bite.
But seriously though there's something about a palm being itchy, especially the thicker pad where the hand begins to transition into the wrist that just is so much more persistent than anywhere else.
People have itchy palms? Itchy enough that they bite them?
That's fucking weird.
That's literally never happened to me, it sounds super strange. Are y'all putting stuff on your hands that's tearing up your skin? Do you moisturize regularly?
I have sensitive skin, but spend a lot of time in a kitchen with wet hands. Unscented soap to wash my hands about a dozen times a day, and unscented moisturizer to keep my skin from cracking. I'll use a thicker waxy moisturizer during the winter when it's really dry out.
I use my hands for weightlifting and golf, so I have to manage my callouses, and in the kitchen I'll pick up various small cuts and burns. My hands don't look perfect but they've never.. itched?