Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Junctional epidermolysis bullosa ?
    ### Response:
    Junctional epidermolysis bullosa (JEB) is a type of Epidermolysis Bullosa, a group of genetic conditions that cause the skin to be very fragile and to blister easily.  JEB is separated into two categories: the Herlitz type and the Non-Herlitz type. The Herlitz type of JEB is very severe, and individuals with this condition often do not survive infancy.
    