Hives

He went out for 15minutes in the car and came back complaining he was bitten by mosquitoes. I thought that was strange because its winter. The next day it became worse, to the point he was crying for help. I figured out it was Hives and and a mild antihistamine helped straight away.

It was very scary. He is allergic to dander so he usually reacts with hives when licked by my Mum's dog but its never like this.