One of the IRN I will soon be getting is currently being treated for lice and/or mites...not now 100% sure which, if not both. He has lost some feathers around his neck.
Could anyone explain to me more about these lites and mice...ooops...I mean mites and lice

Is it 100% cureable, are there any permanent side-effects, what are the symptoms etc. Is there anything in particular I should know about these things???? How do birds get them??
Thankyou for any info you may be able to share!!! Thanks heaps!!