Magnetic resonance imaging of the lower cervical region and upper thorax was performed (Figure 2 ). The white blood cell count was 40 000/µL during the first week, then decreased to 15 000/µL. Polymorphonuclear leukocytes consistently made up 50% to 60% of the total number of white blood cells, and no nonsegmented polymorphonuclear cells were present. The erythrocyte sedimentation rate was 95 mm/h, and C-reactive protein reached a level of 9.3 mg/dL. Blood cultures and serologies were negative for toxoplasmosis, other agents, rubella, cytomegalovirus, and herpes simplex. An ultrasonographic evaluation showed no structural abnormalities of the kidneys or urinary tract. The skin lesions continued to enlarge for 2 weeks. When the patient was discharged at 2 months of age, the lesions had decreased to 60% of the former size.