What is Itch (Pruritus)?
Itch (Lat. pruritus) is a skin sensation that provokes a desire to scratch (1). Itching occurs when certain substances produced by the body, like biliary salts or histamine, or those coming from the outside, like wool or nickel, irritate nerve endings in the skin.
Itch is not the same as tingling, or burning pain; they may sometimes all appear together, though.