What would happen if i re-pierce through a keloid on my ear?

It may come back : No one knows exactly why keloids form but they often follow piercings. If you have had a keloid treated most would adivse against re-piercing. If you insist then be sure to only use high quality jewelry made from 18k gold, or perhaps surgical steel or titanium. Avoid all costume jewelry. Beware that the keloid can come back or get bigger with any jewelry.