Can a nerve ending protrude from a healed 3 year old nipple piercing If so what do you do?

Yes, it's possible for a nerve ending to protrude from a healed nipple piercing, although this is relatively rare. If you notice something unusual like a protruding nerve ending, it's essential to consult a healthcare professional or a piercer experienced in body modifications. They can assess the situation and recommend appropriate treatment, which may include monitoring, removal, or other interventions if necessary. Avoid trying to treat it yourself to prevent further complications.