What is it that causes you to itch?

Question

Such as when just randomly you will have a crazy itch on your leg or your arm or something. What makes you have to itch? I'm not talking about a mosquito bite or anything.

jw, thanks :)

Answer 1

i wish i knew!

haha, reading this question made me itch my back

:(

and arm.

Answer 2

i think its when somethin touches a hair on ur body (to small to see) and that make you itch .. i think  lol