Bandaid will be good. The old nail, will not fall off until there is no more blood supply to it. You might want to stop in at the health dept or your doctor to have it removed if it is very loose, painful and still hanging on. I lost a nail once and I just kept it clean, covered and dry until it fell off on its own. By then the skin underneath was healed. Nails are dead above the fingertip. The part stuck to the finger and the half moon part does have a blood supply and is alive.
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