Why do mosquito bites get more and more itchy when they scratch the bag?

The itching of mosquito bites is due to the fact that the human body is allergic to a variety of enzymes (such as antihemagglutinin) in the saliva injected by mosquitoes, and it is also because of allergies that histamine is secreted in large quantities, causing local redness and swelling. When you grasp hard, it should make the injected saliva spread through capillaries or interstitial fluid, the harder you grasp, the more it spreads, the larger the allergic area, and the more histamine is secreted, so that the allergy area and the severity of the allergy will be aggravated. Preventive medicine first-year students,If there is a mistake in writing, please correct it...

Remember.

Shanghai Jiao Tong University research has found that our brain rewards the central nervous system will make us feel disgusted by itching, and constantly scratching will make dopaminergic neurons transmit a sense of pleasure, so we prefer to "scratch", after being bitten by mosquitoes, it is best to wash with alkaline soap to prevent redness and swelling, or use cold water ice cubes to relieve swelling pain, scratching will only make the redness and swelling bigger and bigger, can not stop itching.

Almost everyone has the unpleasant feeling of being "bitten" by mosquitoes, in fact, it should be said that they are "stung" by mosquitoes. Mosquitoes can't open their mouths, so they won't bite on the **, it actually uses 6 needle-like structures to pierce people**, these short needles are the center of the mosquito's edible mouthparts.

These short needles suck human blood in the same way that they draw blood; The mosquito also releases saliva containing anticoagulants to prevent blood from clotting, so that it can feast peacefully. When the mosquitoes are full of food and drink and float away, all they leave behind is an itchy lump.

However, the itchy sensation is not caused by a short needle pricking or chemicals in the saliva. We feel itchy because the body's immune system releases a protein called histamine to fight foreign substances, and this immune response triggers an allergic reaction at the bite site. Histamine causes swelling of the tissues around the bite when blood flows to the bite site to speed up tissue recovery, and the intensity of this allergic reaction varies from person to person, with some people having a more severe allergic reaction to a mosquito bite.

Only female mosquitoes bite mammals because they have to suck blood every three or four days to get the protein they need to make eggs; Male mosquitoes mainly feed on nectar, while female mosquitoes use animal body heat and physiological changes to search for targets, which may be why human ankles and feet are more commonly bitten by mosquitoes, because the blood vessels in these parts are closer to the body surface, so more body heat is released.

Why is it that after being bitten by a mosquito, the mosquito bag left behind becomes more and more itchy?

1. Reason for bagging: After the mosquito bites, the bitten part will release more histamine, and histamine will cause part of the body fluid to penetrate into the subcutaneous, which will cause the phenomenon of local ** bagging. People with sensitive physique will have large bulges and even blisters after being bitten by mosquitoes due to strong personal allergic reactions;

2. Cause of itching: After being bitten by a mosquito, in the process of histamine against formic acid, the blood will accelerate the flow to the bite to help accelerate recovery, and a large concentration of histamine will lead to itching. In addition, when the capsule becomes larger, it will compress the peripheral nerves on the surface of the **, resulting in local itching.

If scratching is carried out, it will lead to the release of more histamine locally, and the more scratching will occur, the more itchy it will be, and it is recommended that the patient transfer the attention in time to avoid scratching as much as possible. If itching is intense, you can apply it topically with soapy water, other anti-itch sprays, or calamine lotion. If the infection is caused by scratching, anti-inflammatory and antibacterial** is required, such as a wet compress with a topical boric acid solution, and oral anti-inflammatory drugs, such as penicillin, metronidazole, etc.

If the allergy is severe, antihistamines such as loratadine, chlorpheniramine, etc., can be used under the guidance of a doctor. It is recommended that patients spray mosquito repellent as much as possible when going out, or wear long pants and jackets to reduce the possibility of mosquito bites.

When summer comes, there are more and more mosquitoes, for many people, mosquitoes are their lifelong enemies, especially when they sleep at night, they are bitten by mosquitoes at every turn. But there seems to be a saying in real life that says that the larger the bag after the mosquito bites, the more toxic the blind mosquito is. However, experts found that this statement is completely wrong after conducting research, and the size of the bag after the mosquito bite is not large, in fact, it varies from person to person, and it has little to do with the toxicity of mosquitoes.

After being bitten by mosquitoes, the body will be packed, this is because mosquitoes will prick the very sharp things on their mouths into the human body when they suck blood, which will cause damage to the human body. And at this time, it will also secrete some saliva like the human body, which can prevent human blood from blocking the breath of mosquitoes. When mosquito saliva enters the human body, it can inhibit the constriction of blood vessels and prevent platelet aggregation.

After the saliva of mosquitoes is in contact with the human body, it will lead to local allergies, and after the socks are large, they will find that their **local edema or itching will also cause inflammation. <>

After a mosquito bites, the size of the mosquito bag is not directly related to the toxicity of the mosquito, in general, it is actually different from person to person, and the human immune system is related, after all, the human immune system is strong and weak, and the reaction caused by the mosquito bite is not the same. Some people don't actually react after being bitten by mosquitoes, but most people will have a red rash or pimples after being bitten, accompanied by some itching. <>

Some people with allergies will have large blisters or swelling and pain around them after being bitten by mosquitoes, and it will take a long time to subside. And many people will definitely tickle after being bitten by mosquitoes, which will cause the mosquito bag to be more serious and will release a substance called histamine, so after being bitten by a mosquito, it will be more and more itchy, and the mosquito bag will be scratched bigger and bigger, and this mosquito bag will also get better and slower.

Break open a garlic clove, smear the mosquito bite bag with the section, it will be good for a while, and it will relieve itching.

If it is scratched, it is an ugly scar.

In fact, if you don't scratch it, it will get bigger, and it's better not to scratch it.