had some eggs hatch out from our incubator the past couple days, but there were some complications. Had to preform many assisted hatches, all of which the chicks ended up being fine. I don't know if this has anything to do with it, but one chick has this weird, almost skin tag looking thing at the base of his back, where his oil gland I think would be. I can't put him in with the other chicks because they zero right in on it until he bleeds. Does anyone know what this is, why it happed, and any suggestions on what I should do besides keep him separate from others?