Why Do Bug Bites Itch?

(youtube) Hank explores a vexing question asked at picnics and beach parties everywhere: Why do bug bites itch?
MilkmanDansays...

I used to get lots of swelling and extreme itch from a normal mosquito bite, but after living in Thailand for 7 years and getting much more frequent exposure (read: I get bit a lot more here than I did in near-desert Kansas, which isn't that surprising), my reactions to mosquito bites seem to be a lot smaller than they used to be.

Do we develop a tolerance/lessening in allergic reactions to mosquito saliva with frequent exposure?

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