Below is an instruction from Human. Write a response.
    ### Instruction:
    What causes Pigmented purpuric eruption ?
    ### Response:
    What causes pigmented purpuric eruption? The cause of pigmented purpuric eruption is unknown. Occasionally, it occurs as a reaction to a medication, food additive, viral infection or following exercise. In rare cases, there appears to be a genetic component.
    