Yellowish fluid from behind the ears?

I dont know if this is really the same, but I've looked all over the internet and I couldn't find anybody with the same thing happening to them. I got my ears peirced about a year ago, and they have long since healed over, because they got infected. Now, the back of my ear (where my ear connects to my head) is leaking a yellowish fluid, that dries crusty after a while. It plays up after I've had a shower, and then it heals for a while, then it  plays up again. It's not a large amount of fluid, but i am ony young (12). My Dad and i have been putting colloidial silver on it to see if that helps, and it does, a bit. It is slightly itchy, but not that bad. I'm really hoping for some easy to understand advice on what to do, can anyone help??!?