Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) familial pityriasis rubra pilaris ?
    ### Response:
    Familial pityriasis rubra pilaris is a rare genetic condition that affects the skin. The name of the condition reflects its major features: The term "pityriasis" refers to scaling; "rubra" means redness; and "pilaris" suggests the involvement of hair follicles in this disorder.
    