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The beak keeps growing, by chewing on wood, toys etc it wears down. also the outer layers peel off. The bird usually rubs the beak on cage bars, perches to get the layers off. His beak tip might have been broken and now he's trying to get it back in shape.
If I've misunderstood what you were asking, sorry and please ask again.

This is an article on beaks.

http://www.birdsnways.com/wisdom/ww53eiv.htm

After rereading your first post he might have broken the tip off. What you are seeing would be the new tip growing in. I don't know how to post a pic. I have pics of my senegal with the layers on his beak. Also my hahns with a scrape on his lower beak. If he's eating OK and no blood he should be OK. But if you are concerned than take him to your vet. He would be able to see the beak and tell you if its a problem.
Good luck, I know I'm not much help here.

It may have been trimmed short by a vet. Beak trimming is usually not necessary unless there's a deformity, but somehow it has gotten to be part of the "grooming" procedures adopted by many vets. Both clinics I have worked at do it along with wing and nail trims.

Normally, a bird will keep its own beak trimmed to what it's supposed to be by chewing on toys, eating, and rubbing it on perches and toys. I prefer not to trim a bird's beak routinely because it can mask dietary problems that might cause beak overgrowth that does not get worn down through normal use.

It sounds like it was trimmed very short by the vet and is growing back in. Sometimes, at the owner's request, a vet will trim it very short like that - sometimes going into the core of the beak and drawing blood, even - because the bird bites. I heartily disagree with this method, but it is still done. My advice is to leave it and not trim it anymore. If it overgrows in the future, you need to examine the bird's diet and adjust it with advice of your vet.