A 6years old boy presents with joint pain,hematuria and blood in the stool following an episode of pharyngitis 2weeks ago. Examination reveals palpable red lesions on lower extremities as seen in fig ,This patient's disease is most similar to which of the following disease? 1.Idiopathic thrombocytopenic purpura
2.SLE
3.Berger's disease
4.Osler Weber rendu syndrome