Hey bud, this could be anything from a simple rash to a friction burn. However, it isn't going away and that isn't a good sign. I have no idea what it is, but you NEED to know and if its something that needs treatment...suck it up and go get it checked out. You only get one set of this equipment, take care of it. And from now on I hope no more "after school specials" without a raincoat for that lil guy! Good luck!