Anaphylactoid purpura Henoch-Schonlein Purpura (HSP)is characterized by intermittent purpura, arthralgia (74%to 84%),abdominal pain (61%to 76%),and renal disease (44%to 47%).Typically,palpable purpura appears on the extensor aspects of the extremities,which become hemorrhagic within a day and start to fade in about 5 days. Anaphylactoid purpura ⚫ Henoch-Schonlein Purpura (HSP) is characterized by intermittent purpura, arthralgia (74% to 84%), abdominal pain (61% to 76%), and renal disease (44% to 47%). Typically, palpable purpura appears on the extensor aspects of the extremities, which become hemorrhagic within a day and start to fade in about 5 days