Facial hyperostosis (HP_0005465, a Human Phenotype Ontology term) can be described as follows. Excessive growth (overgrowth) of the facial bones, that is of the facial skeleton. Also known as: Enlargement of the facial bones, Excessive growth of facial bones, Excessive growth of facial skeleton, Hyperostosis of facial bones, Hyperostosis of facial skeleton, Hypertrophy of the facial bones, Increase in size of the facial bones, Overgrowth of facial bones.