Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Livedoid vasculopathy ?
    ### Response:
    Livedoid vasculopathy is a blood vessel disorder that causes painful ulcers and scarring (atrophie blanche) on the feet and lower legs. These symptoms can persist for months to years and the ulcers often recur. Livedoid vasculopathy lesions appear as painful red or purple marks and spots that may progress to small, tender, irregular ulcers.
    