I had a chick hatch with unabsorbed yolk sac. I left him in incubator to lay there and absorb sac over night and sac did absorb. But there is a pencil eraser size red nub where sac was.. I applied triple antibiotic to it and he's alone in brooder so other chicks don't peck at it. He's walking around and active. my question is. Will it heal and disappear. Has anyone experienced this?