Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Buschke-Ollendorff syndrome ?
    ### Response:
    Buschke-Ollendorff syndrome is a hereditary disorder of connective tissues, which are tissues that provide strength and flexibility to structures throughout the body. Specifically, the condition is characterized by skin growths called connective tissue nevi and a bone abnormality known as osteopoikilosis.
    