Val should also be able to give you good information on this and if I remember correctly, some of the issues that affect the eye like this are not necessarily facial abscesses but I can't for the life of me remember what it is. Not saying that's the case with your little one, just kind of thinking out loud.
Either way, it's good you're seeing the vet. They'll likely need to do x-rays, which vary in cost, depending on the vet. And until you've been there and know what's going on, it's hard to say what meds will be prescribed, though Val will be able to give you a better answer on this.
Good luck!