After a day at work as a dish washer, my pants were wet, and for a while, the head of my penis was rubbing against my pants. After a while, it felt some discomfort, as if there was something scratching at it. When I got home, I poured some peroxide on it to see if there were any small cuts. Instead, the spot flared up, and began to look like it was swelling with pus! Why would this happen? What is happening?