A 8-year-old Caucasian boy with history of acute lymphoblastic leukemia

A 8-year-old Caucasian boy with history of acute lymphoblastic leukemia comes to the Emergency Department because of a painful rash. His temperature is 36.7°C (98.1°F), pulse is 105/min, respirations are 22/min, and blood pressure is 108/70 mmHg. Physical examination shows a painful, blistering rash that spans most of his left arm. Which of the following is the most likely diagnosis?

  1. Atopic dermatitis
  2. Chickenpox
  3. Herpes zoster
  4. Impetigo
  5. Staphylococcal scalded skin syndrome