Okay, so I got a cute little baby pigeon on saturday the 13th, and now the little squeaker has cuts on his back. The parents have been pecking at one that seems to be trying to come in and help. They also seem to stand on it a lot. Could this be it?
Try bluecoat, I'ts for open wounds, not for pigeons I don't think, but you might just try it. Also ask at your farm store what dressings they sell. Just try that, I don't know what else you could do. If the squab is old enough and injured badly enough to justify it then you could take him away and hand raise him. Maybe someone else will have an idea.