Long-term complications are rare but do occur, primarily in adults. The most common complication of Henoch-Schonlein purpura is kidney damage. HSP leads to renal failure in around 1% of children and up to 40% of adults. Another complication is intussusception, which causes the intestines fold upon themselves and obstruct the bowels. Pustular and vesiculobullous lesions may form on the areas affected by the purpura. Development of lesions is rare and particularly uncommon in children.

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