Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Epidermolytic ichthyosis ?
    ### Response:
    Epidermolytic ichthyosis (EI) is a rare, genetic skin disorder. It becomes apparent at birth, or shortly after birth, with reddening, scaling, and severe blistering of the skin. Hyperkeratosis (thickening of the skin) develops within months and worsens over time.
    