nipple piercing???

I have both my nipples pierced I've had them now for a year.
My left one is perfectly healed and I have no trouble with it.. but the right one, doesn't seem to be healing!!
It has a small bump of puss on the edge that goes away and comes back agin.
I do use tea tree oil when it comes back.
It sometime puss which is . yellow/ green
And it's smells.
How can I fully heal it properly? Also I want to take the right one out can I??