Industrial piercing

So I’ve had this piercing since April of this year, and I understand they can take a very long time to heal. I had a small scar bump on it for a while, and was able to get rid of it with saline wash and diluted the tree oil.

Now, I’ve gotten two small ones and when I go to put tea tree oil on them, they burst (even when I’m not pushing too hard) and they leak weird stuff for a couple days and it builds up on my ear (I obviously clean it throughout the day) My nurse friend says if it was infected it would hurt and smell, and it doesn’t. I’ve been keeping this clean for months, and trying to get it to heal, and having these problems is very troubling. Any advice?