What causes that?
scientists are not really sure why itches occur. the cause of an itch is the release of chemicals spontaneously causing the irritation. scientists are not sure why the sudden release of chemicals happen but they know that is what causes an itch.
It is usually a reflexive response to an irritant, the release of histamine is often involved in the process. There are many causes: allergies, harsh soaps & cleaners, skin disease,etc.
Yeah it's a reflex response pretty much... haha. It has to do with allergies, skin diseases, and etc.