May flowers aren't the only things April showers can bring. Spring also heralds the arrival of mosquitoes.
Mosquito eggs can survive in a dried state for years before being reactivated by water.
Any outdoor place with standing water is a breeding ground for mosquitoes. When a mosquito bites, it injects a bit of saliva to make the blood flow. It's that saliva that causes the itching and redness of a mosquito bite. Most of the time, irritation is all a mosquito bite will cause. People who have a sensitivity to mosquito bites also may have serious swelling.