Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Sneddon syndrome ?
    ### Response:
    Sneddon syndrome is a progressive condition characterized by livedo reticularis (bluish net-like patterns of discoloration on the skin) and neurological abnormalities. Symptoms may include headache, dizziness, high blood pressure, heart disease, mini-strokes and/or stroke.
    