Why when mosquito bites, it can't just take the blood and go, why do they have to release poison which makes it itch and swell up?
by 
Romiex69x
ANSWERS: 7
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It usually does take the irritant with it when it goes, provided it is not disturbed during the blood-sucking process.
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Well, the poison your talking about is their saliva actually. And why do they need it? Well evn though a moquito's probos-- what do you call that thing again?...anyway, even though it's small, human skin can still feel it. The saliva acts like an anisthetic and numbs the nerves momentarilly so we can't feel the mosquito. The itching and swelling are just an after effect.
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It's not a poison. I alway heard it was a blood thinner in the saliva that irritated you. And the swelling was blood pooling in the spot.
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The "poison" thing that you have mentioned includes an anti-coagulant that keeps the blood from clotting while its still in their proboscis. If the blood clots in their sucking tubes, it could choke them to death. It is the substance that leaves that itchy sensation after they take off.
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I only itch and swell up when I disturb the mosquito before it has finished its meal.
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I wish they would do that I react to mosquito bites bad I swell up.. on a vacation I had a allergic reaction and was sent to the hospital it gave me fever and everything
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