One of my earlobes is *refusing* to heal. Help!

I got my second set of earlobe piercings done about 9 weeks ago now and one of them is just refusing to heal no matter what I do. I was diligent about sleeping on my back, cleaning daily, using saline spray, all the right things. The other 3 earlobe piercings I have are all doing great, it’s just this one little bastard that refuses to be nice. I’m wearing flat-back titanium posts from neometal so I don’t think it’s an allergy. I’m really at a loss as to what else I can do to help it. Any advice?