Mosquito bites are itchy, red welts caused by mosquitoes feeding on blood. When a mosquito bites, it injects saliva containing anticoagulants to prevent blood clotting, triggering an immune response.

Do mosquito-repellent plants really work? Buzzing past your ear as you lounge on the patio, leaving welts on your kids’ ankles as they play in the grass, preventing you from sleeping with their ...