Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Pustular psoriasis ?
    ### Response:
    Pustular psoriasis is a rare form of psoriasis that is characterized by widespread pustules and reddish skin. This condition can occur alone or with plaque-type psoriasis. Most cases of pustular psoriasis are thought to be "multifactorial" or associated with the effects of multiple genes in combination with lifestyle and environmental factors.
    