Below is an instruction from Human. Write a response.
    ### Instruction:
    What are the complications of Henoch-Schnlein Purpura ?
    ### Response:
    In children, the risk of kidney damage leading to long-term problems may be as high as 15 percent, but kidney failure affects only about 1 percent of children with HSP.1 Up to 40 percent of adults with HSP will have CKD or kidney failure within 15 years after diagnosis.
    