When mosquitoes “bite” you they are actually sucking a needle like proboscis (nose) into your skin so they can suck your blood like that evil vampires they are. When they do this they also inject an anti-coagulant into your body so the blood can’t clot while it’s getting it’s drink on. The anti-coagulant itself is what causes the irritation because it triggers a histamine reaction that lasts until the body is healed and rid of the anti-coagulant.
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