Due to having no need for air or sense of smell after her transformation into a Bane, Alexandra’s nose is surgically removed. The parts inside her head of her sinuses are filled with the nostril inserts, with the entire outer part being removed and smoothed over with synthetic skin.
This final surgical change, completes Alexandra’s extreme dehumanization before her encasement, as her entire face has basically been removed, leaving only black orbs for eyes.