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When mosquitoes bite they are injecting saliva containing anti-coagulants (which prevent blood from clotting) into their victim. As a result of this, a body's immune system will respond causing burning, itching, and swelling.
The effect of a mosquito bite on a person will depend on the sensitivity of the person. In most cases, itching and swelling subsides within several hours. In some highly sensitive people, however, discomfort may persist for several days.
*Scratching mosquito bites can result in infection if bacteria under fingernails are transferred to the wounds.