Let me clarify first though, are you saying he hasn't moulted for five months, or he lost feathers but they haven't been replaced/grown within five months?
Clipped or broken feathers will grow back only after the bird moults. Since the base of the feather is still attached, it is not treated by the body as a lost feather.
And how are they deformed? The edges or primaries are usually a little wrinkled until fully grown. And the edges are normally golden.
Does your bird preen himself? If he's bad at putting his feathers in place, it could just be a case of a bad hair day. One of our IRNs didn't quite get it right until a year of age.
If he has night frights (frightned in the night and flaps wildly about his cage) that could damage feathers. Or banging into toys if the cage is too crowded, one of our IRNs used to damage his tail when his cage was too crowded for him (differences in IRN tastes, Hane loves his crowded but Tsume loves it more open).
Birds can look awful when moulting. Here's pictures of Tsume (sister's bird) moulting:
Right now he just looks like he is a bit tussled and hasn't put his feathers back in place. The new primary feather seems normal to me from the picture.
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If your bird has moulted but the feathers are not growing back at all or if they are really growing abnormally, then the rest of this post could apply. If not, then ignore the rest of this post.
It's not normal for the feathers to take that long or for them to be deformed. I don't know if cancer could cause this.
I don't want to say this but it's best to be prepared when you talk to your vet. The first two things I can think of that would cause feather deformation are Polyoma Virus and PBFD (Psittacine Beak and Feather Disease).
Since you cannot find an avian vet, you should go to your vet with any information you can find on those two diseases.
Call an avian vet and ask if he/she would consult with your vet to form a proper diagnosis. An avian vet would know what tests should be run according to your birds problems.
I don't want you scare you with anything really bad, those are just the things that popped into my head. Please call an avian vet, they don't have to be nearby to help. And I'm sure your vet would appreciate the help since he/she is not familiar with avian diseases and diagnosis.
If you've already been to your vet at the time of this posting, you can still call an avian vet and connect them with your vet. And the avian vet will probably be able to answer any questions having to do with the bump on his wing too.
I hope I helped, even if just a little and didn't alarm you too much.
If anyone here from Auss. has a vet that might help, perhaps they'll give you a number to call as well.
