患儿,男,4个月。以反复发热、皮肤紫癜100天为主诉。患儿生后20天始发热,体温37.5℃至38.5℃,热型不规则。躯干、四肢成批出现瘀斑,呈鲜红色、暗褐色至紫色,直径2mm至30mm不等,持续数天自行消退。伴面色苍白,鼻腔及牙龈出血、口腔溃烂、腹胀、排黑便,1～2次/日,质稀量少,虚弱无 Children, male, 4 months. To repeated fever, skin purpura 100 days as the main complaint. 20 days after birth, children with fever, body temperature 37.5 ℃ to 38.5 ℃, irregular heat. Trunk, limbs appear ecchymosis batch, was bright red, dark brown to purple, diameter 2mm to 30mm, continued to subside on their own for several days. Accompanied by pale, nasal and gingival bleeding, mouth ulceration, bloating, Pai black, 1 to 2 times / day, less mass thin, weakness without