Why do mosquito bites itch?

Answer by  hibpmgirl (2166)

They have a chemical in their saliva that they put into your skin as they suck blood, it is used to thin your blood.

Answer by  EddyNfld (147)

Mosquito Bites itch because when they bite, in order to keep the blood from coagulating it will inject a anti-coagulant to allow the blood to flow for it to eat. This anti-coagulant causes a allergic response which causes the itching. the severity differs among people due to different reactions.

Answer by  Riley (765)

A person develops a slight allergic reaction around the bite when the female mosquito injects her saliva, teeming with digestive enzymes and anticoagulants into our body. This produces a histamine response.