Mosquitoes bite humans to drink their blood. The nutrients available in human blood helps female mosquito to make eggs for reproduction.
Mosquito uses the sharp tip of its straw like mouth to pierce human skin.
That time it locates the blood vessel . It injects saliva which makes the blood not to clot .
Our body recognizes this saliva as the foreign substance. This causes an immune system response.
The swelling around the bite is caused by histamine which is produced by immune system.
Histamine increases the blood flow and white blood cell count around that area.
This causes inflammation or swelling.
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