Incessant scratching is not due to additive sensation, it is because your scratching does not work

The reason is that, at least from studies in mice, when you scratch to create pain, the brain in response begins to produce more serotonin to inhibit pain (the brain does not want to have pain in your body)

and sometimes scratching an itch is pointless and silly and leads you down a painful path you can't get out from 😜

you create the problem
#jussayin