Mr. Jingles...He might have plucked a blood feather. As long as the feather is fully out and the bleeding has stopped, he should be fine. If he is stained with blood at all, a spray bottle with warm water set on a fine mist should do the trick, it will just gradually fade as he grooms himself. As far as treating a wound, well I am fortunate that I've never had to to that with my birds. Probably dabbing the area with warm water would be the best since I'm not sure what anticeptics are toxic to birds (I think Bactine might be okay). Probably a phonecall to a vet would be in order if it was a large wound.
-If you want the best seat in the house, you have to move the cat.