Why is it when I have a sour on my tounge, I can’t leave that mother alone? That goes for anything; scrape the roof of your mouth and you just have to agitate it. Some people do nastier things (scabs… yuck), but why do people do this?
Picking scabs - I know exactly why I do it. I do it so I can do it again.
And why do I want to do it again? Obvious. So I can do it yet again.
And why…
Oh dear.
My WAG: anxiety. Just like smoking or tapping a pen. IT gives some sense of control. THere is probably some primal reason as well