Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Thrombotic thrombocytopenic purpura, congenital ?
    ### Response:
    Thrombotic thrombocytopenic purpura (TTP), congenital is a blood disorder characterized by low platelets (i.e., thrombocytopenia), small areas of bleeding under the skin (i.e., purpura), low red blood cell count, and hemolytic anemia. TTP causes blood clots (thrombi) to form in small blood vessels throughout the body.
    