Hahaha. I had something like that happen to me in college once.

My mom had sent me boxers for Christmas sophmore year. I washed them, and one day put them on. Halfway through the day, my pen0r started itching like crazy. I went to the restroom, and my entire crotch was ablaze in a rash. I took off the boxers when I got home, and the next day everything was good. For the sake of science, I put them on another day, blammo, flaming penis. I then threw them away, and everything's been good since then h: