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Topic - Why have we evolved to itch?

JuneBob on 30 Jul 2013
Having been biten about 80 billion times by some pesky insects last night (it may be less, but I know I couldn't feel worse) and now writhing around in total agony, I'm wondering why we have evolved to itch?
What on earth is the benefit? It just makes a tiny bite many times worse, possibly resulting in me scratching open the wound, getting infected and dying. How is this a good natural response? It seems like a total fail by evolution (or god fwtw) to me.
I have been unable to sift out a good answer from the dross that google returns, so maybe someone here knows?
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