Why Do Mosquito Bites Itch?

Why are mosquito bites so itchy? Stop scratching while Jessi explains!

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SOURCES:

http://www.mnn.com/health/fitness-well-being/stories/why-do-mosquito-bites-itch
https://www.highlightskids.com/science-questions/why-do-mosquito-bites-itch
http://kidshealth.org/parent/asthma_center/words_know/histamine.html
http://phenomena.nationalgeographic.com/2013/08/06/heres-what-happens-inside-you-when-a-mosquito-bites/
https://commons.wikimedia.org/wiki/File:Aedes-albopictus.jpg
https://commons.wikimedia.org/wiki/File:Anopheles_stephensi.jpeg
https://commons.wikimedia.org/wiki/File:Monarch_Butterfly_Danaus_plexippus_Proboscis_2591px.jpg