Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Keratosis follicularis spinulosa decalvans ?
    ### Response:
    Keratosis follicularis spinulosa decalvans (KFSD) is a rare, inherited, skin condition. KFSD is a form of ichthyoses, a group of inherited conditions of the skin in which the skin tends to be thick and rough, and to have a scaly appearance. The face, neck, and forearms are frequently involved.
    