Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Mondor disease ?
    ### Response:
    Mondor disease is a rare condition that is characterized by scarring and inflammation of the veins located just beneath the skin of the chest. The affected veins are initially red and tender and subsequently become a painless, tough, fibrous band that is accompanied by tension and retraction of the nearby skin.
    