Hemifacial microsomia.

Hemifacial microsomia (HFM) is a condition in which the lower half of one side of the face is underdeveloped and does not grow in a normal pattern. After clefts, this is the second most common facial birth defect. Etiology of HFM is unknown, but prenatal exposures of some drugs and genetic abnormalities may be associated with the condition. Diagnosis and treatment of HFM is challenging due to a wide spectrum of deformities. Here, we present a case of a 10-year-old boy, who complained of facial asymmetry on left side of the face and deformity of the left ear since birth.