1 doctor weighed in:

How do you get a bug bite reaction?

1 doctor weighed in
Dr. Joseph Bouvier
Pediatrics

In brief: See below

Bug bites can cause what is referred to as a "local reaction" which includes redness, swelling, warmth and itch.
This usually is the reaction that our bodies have to the saliva or other minor venom-like components in a bite. We release histamine which causes vessels to become "leaky" and fluid leaks from them along with some red blood cells - thus you get swelling, redness, warmth and itch.

In brief: See below

Bug bites can cause what is referred to as a "local reaction" which includes redness, swelling, warmth and itch.
This usually is the reaction that our bodies have to the saliva or other minor venom-like components in a bite. We release histamine which causes vessels to become "leaky" and fluid leaks from them along with some red blood cells - thus you get swelling, redness, warmth and itch.
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