Relieve a Mosquito Bite with Nail Polish
The itch is actually caused by blood rushing to fill in the small entrance, but not be able to due to the proteins the mosquito used as an anti-clotting device. Thus it inflames, and the blood pressure sets off the nerve endings. Tape/nail polish actually keep the area around the entrance more stable, letting it heal faster/ become less inflamed. Scratching also only irritates the area further, meaning a longer heal time = more itching.