This is a more common consequences then most people realize. The size of the hole relates to the stretching of the earlobe skin by the weight of the ear ring. This can result in just a elongation of the piercing to a large hole to actually splitting of the bottom of the ear lobe.
Depending on the size of the hole a simple closure to actual repair and reduction of the lobe may be required.
Often these ear lobe repairs can be performed under local anesthesia and with straight forward recovery.
Thanks again for your question.