Below is an instruction from Human. Write a response.
    ### Instruction:
    What causes Sneddon syndrome ?
    ### Response:
    What causes Sneddon syndrome? The cause of Sneddon syndrome is not well understood. It is possible that the syndrome has more than one cause (or way in which it may develop in a person). Some people develop Sneddon syndrome in association with other medical conditions such as obliterating vasculitis and antiphospholipid antibody syndrome.
    