Boy with purple legs and blood in stools. stockbot 0 2 06.17 10:16 https://vietnamnews.vn/life-style/1657567/boy-with-purple-legs-and-blo… + 0 https://vietnamnews.vn/rss/life-style.rss + 0 The cause of Henoch-Schönlein Purpura is unknown, but it is commonly triggered by a viral infection.