I know you’ve done it.
Everyone does it. With full knowledge that it’ll result in more pain. Or even a scar.
But why is it sooooo tempting to do so?
Even though it’s mild, the pain is combined with the release of endorphins. Effectively, it feels like a reward.
Come to think of it, it’s actually a grooming activity, with a strange combination of a form of displacement, which is, too, a good distraction.