Science Behind Mosquito Bite | Why do mosquito bites itch?

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A mosquito doesn't actually bite. A mosquito sucks our blood through a straw-like structure called a proboscis.
Science Behind Mosquito Bite:
Scientists have discovered that the mosquito’s mouth has a sophisticated system of thin needles, each of which pierces the skin, finds blood vessels and makes it easy for mosquitoes to suck the blood out of them.

Two of these needles, called maxillae, have tiny teeth. The mosquito uses them to saw through the skin. They’re so sharp you can barely feel the mosquito biting you.

Another set of needles, the mandibles, hold tissues apart while the mosquito works.

Then the sharp-tipped labrum needle probes under the skin, piercing a vessel and sucking blood from it.

The sixth needle – called the hypopharynx – drools saliva into us, and delivers chemicals that keep our blood flowing. Mosquito saliva also makes our blood vessels dilate, blocks our immune response and lubricates the proboscis. It causes us to develop itchy welts and serves as a conduit for dangerous viruses and parasites.
Check the video Why do mosquito bites itch?