Recurrent Abdominal Pain with A Late Clue: Diagnosing Henoch-Schonlein Purpura After Skin and Joint Involvement I Gusti Agung Ayu Sriningrat1*, Calista Dinda Natania Rau1, Ni Nyoman Wulan Yuanitasari1, Sulistio Ivena Clairine1, Putu Pradnyanita Mustika2 Abstract Background: Henoch-Schonlein purpura (HSP) is the most common childhood vasculitis, primarily affecting children under 10