Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) auriculo-condylar syndrome ?
    ### Response:
    Auriculo-condylar syndrome is a condition that affects facial development, particularly development of the ears and lower jaw (mandible).  Most people with auriculo-condylar syndrome have malformed outer ears ("auriculo-" refers to the ears). A hallmark of this condition is an ear abnormality called a "question-mark ear," in which the ears have a distinctive question-mark shape caused by a split that separates the upper part of the ear from the earlobe.
    