Why does a mosquito bite swell with the mere act of scratching it? I understand why it would ITCH more, but what makes it swell? Scratching regular skin doesn't make it swell...........
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Answer:
When it bit you, the mosquito injected an anticoagulant to stop your blood clotting while it was sucked up. This anticoagulant is probably in a pool just under the skin, and is what actually causes the itching and swelling. If you apply pressure to the skin above it, as you do when you scratch, you push the anticoagulant around into unswollen flesh, making it swell.
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