Why is it so hard to stop? Face-touching rewards us by relieving momentary discomforts like itches and muscle tension. These discomforts usually pass within a minute, but face-touching provides immediate relief that eventually makes it a habitual response that resists change. Source 2q.
I always find it strange how I get these random urges to touch my face or any part in my body. It's like those annoying itches that somehow pops in; almost like a bug poking you constantly any the only way is to touch the strange invisible spot.