Why do we get itchy?
The skin can feel different things like sharpness of things, or pain, or touch or itching. But the brain interprets what the skin is feeling. The nerves take the information about what the skin is feeling all the way to the brain. Then the brain uses that information to figure out if it’s pain or itching we are feeling.
Some materials like wool make us itch. It depends how sensitive we are to wool. Itching is very helpful for our bodies to deal with things it doesn’t like. We itch so our brain can tell our body to do something about it, like move our arms to scare a mosquito on our arm.