Abnormality of facial musculature Hypomimic face The movement and position of facial muscles are often interpreted as expressing emotions. Individuals with hypomimic face may be perceived as expressing less emotion than normal. Dull facial expression Decreased facial muscle movement UMLS:C0813217 HP:0008769 A reduced degree of motion of the muscles beneath the skin of the face, often associated with reduced facial crease formation. SNOMEDCT_US:248149005 Decreased facial expressions UMLS:C4280635 HP:0000338 Hypomimia UMLS:C1862474 Decreased facial expression