Born With Pierced Ear Lobes

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I am just trying to gather some information to see if anyone else has ever heard of this...My son was born with his ears pierced all the way thru...his dad has dimples in his ear lobes that are on both the front and back but not all the way thru. Has anyone else ever heard of this and know of a medical name for it? I am curious where the gene originated from. Thanks:)