Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) craniofacial microsomia ?
    ### Response:
    Craniofacial microsomia is a term used to describe a spectrum of abnormalities that primarily affect the development of the skull (cranium) and face before birth. Microsomia means abnormal smallness of body structures. Most people with craniofacial microsomia have differences in the size and shape of facial structures between the right and left sides of the face (facial asymmetry).
    