system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why do we get the urge to peel the rough skin off of a healing wound, when it will ultimately make the healing process longer and the resulting scar look worse?
gpt
As the skin heals and a scab forms, your brain misinterprets the sensation as an itch.  Scientists aren’t sure why healing skin can feel like and itch... but you’ve learned to scratch itches... so you do, despite slowing the healing process.   You’re an animal responding to stimuli.