A 2-day-old, full-term male infant develops a rash consisting of firm, yellow-white 1- to 2-mm papules and pustules, each surrounded by a distinct erythematous flare. The lesions are scattered over his trunk and limbs, but the palms and soles are spared. A Wright-stained smear of a pustule’s contents reveals numerous eosinophils. What is the most likely diagnosis?