I have one and it does irritate and I'm only 14 and I think it could be a build up of sweat and I hope so because I don't really want to see mum and dad about it or a doctor... :/
Hopefully in the next couple of weeks it will go away because it irritates every now and again... I've put the same gel like creamy stuff on it that I use on my face spots and I'm hoping it will clean it up nicely and peacefully, Fingers crossed! :/

And it has a massive white puss on the end surrounded by red skin :/