Here's a link, Cyndie:
http://www.exoticpetvet.net/avian/foot.html
I'd never heard of it either and thought at first it might be the most severe form of what's so unfortunately named "bumblefoot." But it's different.
Here's another description, by a vet I don't know, Louise Bauck, DVM:
... Last year I attended the Association of Avian Veterinarians Annual Conference in New Orleans. Several interesting presentations were given that involved the foot... One well known but frustrating skin problem affecting the feet is called Amazon foot necrosis. This simply means that the skin of the foot experiences patches of devitalization (loss). Ken Welle, DVM, from the United States, spent some time discussing the latest in theories about the cause of this disorder, while Pat Macwhirter, DVM, from Australia, documented some excellent pioneering work on the study of allergens and their role in this and similar diseases. Allergies are poorly understood in birds, but veterinarians have long speculated that certain substances such as tobacco smoke, hand lotions, cosmetics or food ingredients might play a role in some skin diseases of the bird...
I hope the ekkie responds to treatment.
Paca