Below is an instruction from Human. Write a response.
    ### Instruction:
    What are the symptoms of Erythromelalgia ?
    ### Response:
    What are the signs and symptoms of Erythromelalgia? Currently it is very difficult to predict how a person's primary erythromelalgia will affect them overtime. The cause of primary erythromelalgia is not well understood. Much of the literature regarding the long term outlook for people with idiopathic primary erythromelalgia is compiled from individual case reports.
    