Anatomy

A 4-year-old child presented with palpable purpura and polyahralgia without any frank ahritis along with colicky abdominal pain associated with nausea, vomiting, diarrhea and the passage of blood and mucus per rectum. Urine examination revealed proteinuria and microscopic haematuria. Laboratory studies revealed mild leucocytosis, normal platelet count, normal PT and aPTT, eosinophilia, normal serum complement components and elevated IgA levels. Skin biopsy specimen was taken.