Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Erythromelalgia ?
    ### Response:
    Erythromelalgia (EM) is a rare condition characterized by episodes of burning pain, warmth, swelling and redness in parts of the body, particularly the hands and feet. This condition may occur spontaneously (primary EM) or secondary to neurological diseases, autoimmune diseases, or myeloproliferative disorders (secondary EM).
    