A 13-year-old girl with intermittent episodes of bruising was referred to our hematology clinic after several visits to her private physician. The bruises appeared suddenly on her extremities, face, and chin after little or no trauma. The patient had no history of ecchymoses, petechiae, hemoptysis, hematuria, epistaxis, or excessive bleeding. She was not taking any medications. The violaceous facial lesion shown in Figure 1 appeared a day after the patient received several stitches for a chin laceration; she had no other history of trauma. Weeks later, she presented with an area of bluish discoloration of about 9 X 1.5 cm on the medial aspect of her right knee (Figure 2).
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机译：一名13岁的女孩间歇性瘀伤，经过几次私人医生诊治后，被转到我们的血液学诊所。很少或没有受伤后，瘀伤突然出现在她的四肢，面部和下巴上。该患者无瘀斑，瘀斑，咯血，血尿，鼻出血或出血过多的病史。她没有服用任何药物。图1所示的紫癜性面部病变是在患者因下巴撕裂而缝合数针后的第二天才出现的。她没有其他外伤史。几周后，她的右膝内侧呈现出约9 X 1.5 cm的蓝色变色区域（图2）。
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