Yeah, that's how you can get an oddly dull but thought-stopping intense pain that's reminiscent of a bad cramp. The sort that feels like something's taking a bite, but from the inside, or like being punched in slow motion but there's no fist to push away and oh boy that smarts for the love of god make it stop.
The intensity fades as quickly as it sets in but you won't want to touch that part of your body for a while afterwards in case you set it off again. In time a bruise may develop, but not always.
What? Most people do what I have described, it just helps for the scratching feeling, there's no side effect. I don't know where your imagination took you.