A 3-day-old full-term Indian infant presents with a widespread erythematous rash with small papules and pustules on a red base, predominantly over the face, trunk, and proximal extremities. The rash spares the palms and soles. The parents are concerned about infection. Microscopic examination of pustule contents using Wright stain shows predominantly **eosinophils**. The clinical course shown at **D** in the diagram indicates that this rash typically **resolves within the first 24-48 hours**. Based on this presentation and natural history, what is the most likely diagnosis?