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Why do mosquito bites itch and leave a welt?

bites itch leave mosquito welt
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Why do mosquito bites itch and leave a welt?

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When the female mosquito bites, she injects a small amount of saliva into your capillary, the small blood vessel from which she takes her blood meal. This saliva makes the penetration of her proboscis (mouthparts) easier and prevents the blood from quickly clotting. The welt or red bump that appears after the bite are actually a mild allergic reaction to the saliva. Some people are more allergic to mosquito saliva than others and tend to get larger welts. Some people may be more allergic to one type of mosquito than other types. The swelling and itching may last from a few hours to a few days. Occasionally, individuals may be highly sensitive to mosquito saliva and swell significantly. In any case, you should avoid scratching these welts to prevent the introduction of bacteria causing an infection.

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