2nd May 2024

A 9-year-old boy presents with a purpuric rash on his legs and buttocks, joint pain in his knees and ankles, and abdominal pain.

A 9-year-old boy presents with a purpuric rash on his legs and buttocks, joint pain in his knees and ankles, and abdominal pain. He had an upper respiratory tract infection two weeks ago. His blood pressure is normal, and there is no edema. Urinalysis shows mild proteinuria but no hematuria.

Investigations:

Normal renal function tests

Mildly raised IgA levels

Skin biopsy: Leukocytoclastic vasculitis with IgA deposition

What is the most appropriate initial management for his condition?