We evolved the itch to detect the foreign substance. The mosquito just needs the protein to keep your blood from cloting for a bit. It doesn’t care if you itch or don’t.
It doesn’t take much heat to denature the protein that causes the itch and when its fresh it’s not very deep, so a hot spoon (or sometimes I heat up the metal on a lighter) can stop the itch and bump from every happening if you catch it right away.
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