Platelet count is decreased in all of the following condition except:
H. S. Purpura
Idiopathic thrombocytopenic purpura
Thrombotic thrombocytopenic purpura
Systemic lupus erythematosus
Answer is A (H. S. Purpura) The mechanism of ecchymosis or purpura in Henoch Schonlein is vasculitis. There is no thrombocytopenia. All other options are known causes of thrombocytopenia.