In other words, it takes a few days for your body to recover from the bug bite-and from fighting off the foreign substance. Unfortunately, this triggers an inflammatory response-causing the location of your bite to swell and itch.īut why do they remain swollen, red, and itchy for days? Simply put: "The histamine released by the white blood cells in our body takes time to clear up," says Sunitha Posina, MD, a New York City-based board-certified internist. This makes it easier for your white blood cells (your immune system cells) to make their way to the site of the bug bite, so they can "fight off" the saliva or venom. This mosquito saliva is a foreign substance, and your immune system knows that, so it releases histamine-a chemical that makes your capillaries more permeable. Spiders inject a combination of saliva and venom into your skin when they bite you.) When a mosquito bites you, it doesn't just suck out some of your blood-it actually releases some of its saliva into your skin. But most of the time when you're dealing with an itchy bug bite, you're dealing with a mosquito bite. But what about once you have a bug bite? Is there anything you can do to get it to stop itching? We talked to a few experts to find out.īug bites can range from unpleasant to painful. Thankfully, we all know how to avoid bug bites (wear bug spray!). And though bug bites tend to be pretty small, they can be itchy, pesky, and sometimes even painful. While outdoor mosquito repellents can greatly reduce the chances of getting bitten, nearly everyone has experienced a bug bite at one point.
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