Malar flattening (HP_0000272, a Human Phenotype Ontology identifier) is underdevelopment of the malar prominence of the jugal bone (zygomatic bone in mammals), appreciated in profile, frontal view, and/or by palpation. Also known as: Decreased size of malar bone, Depressed malar region, Flat cheekbone, Malar hypoplasia, Underdevelopment of malar bone, Zygomatic flattening.