I don't know what it is, but it is quite concerning. Please call an AVIAN CERTIFIED vet ASAP. Keep in mind that just because a vet "sees birds" doesn't mean they are qualified. I won't even get into the nightmares I have experienced with non avian certified vets. But your little guy needs to go I right away. If cost is an issue, be upfront with your vet and ask about things like care credit or payment plans. I like to do this even though I can afford the care, because it helps me locate a vet who cares more about helping animals than about making money (though they still deserve their fee). But the big thing is DONT WAIT, you don't know what this is, how deep into his face it goes, if it is compromising his ability to breath, or if it is a symptom of a much larger problem.