Histamine: Histamine is released in response to your immune system seeing you were invaded by this pesky buy. The histamine opens the blood vessels and allows your immune system to attack the bacterial, virus and toxins the bug injected into you.
Answered 3/1/2016
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Immune reaction: The swelling is an immunological response to the bite.
Answered 8/27/2013
4.9k views
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