Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Pemphigus ?
    ### Response:
    Pemphigus is an autoimmune disorder. If you have it, your immune system attacks healthy cells in your skin and mouth, causing blisters and sores. No one knows the cause. Pemphigus does not spread from person to person. It does not appear to be inherited. But some people's genes put them more at risk for pemphigus.
    