Hello! Here are my notes + mnemonic on HSP.
IgA-mediated vasculitis of small vessels (IgA and C3 in skin, renal glomeruli, and gastrointestinal tract).
Most common cause of nonthrombocytopenic purpura in children.
Usually follows an upper respiratory infection.
Clinical features are:
Maculopapular rash below waist (Progresses to petechiae to palpable purpura).