A 5-month-old boy, weighing 5 kg, was brought to us with the complaint of a gradually spreading, raised, serpiginous, red streak present on his right foot for the preceding 4 days. Clinical examination revealed an elevated, erythematous serpentine track on his right foot. No other abnormality was detected on physical examination. Routine laboratory investigations were within normal range. What is the diagnosis? (Answer on page 698).
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