J.D. is a postterm infant with lesions of varying morphology including wheals, vesicles, and pustules on her trunk. You suspect J.D. has:

J.D. is a postterm infant with lesions of varying morphology including wheals, vesicles, and pustules on her trunk. You suspect J.D. has:

• A. Cutis marmorata
• B. Erythema toxicum neonatorum
• C. Milia
• D. Contact dermatitis

Answer: (B)

Erythema toxicum neonatorum is a common, benign neonatal rash in term infants that presents within the first days of life with a polymorphic eruption on the trunk and proximal extremities. The lesions vary in appearance, often showing erythematous macules with central vesicles or pustules, giving a flea-bite-like or multifocal look. This benign condition typically resolves on its own within a week or two and requires only reassurance and routine care. Cutis marmorata is a cold-induced, lace-like mottling pattern that appears on the skin and lacks vesicles or pustules. Milia are tiny white keratin-filled cysts, usually on the face, not the trunk, and they don’t present as vesiculopustular lesions. Contact dermatitis would require exposure to an irritant or allergen and usually presents as localized redness with possible itching and vesicles, not the widely distributed pustules on the trunk seen with erythema toxicum neonatorum.

Erythema toxicum neonatorum is a common, benign neonatal rash in term infants that presents within the first days of life with a polymorphic eruption on the trunk and proximal extremities. The lesions vary in appearance, often showing erythematous macules with central vesicles or pustules, giving a flea-bite-like or multifocal look. This benign condition typically resolves on its own within a week or two and requires only reassurance and routine care.

Cutis marmorata is a cold-induced, lace-like mottling pattern that appears on the skin and lacks vesicles or pustules. Milia are tiny white keratin-filled cysts, usually on the face, not the trunk, and they don’t present as vesiculopustular lesions. Contact dermatitis would require exposure to an irritant or allergen and usually presents as localized redness with possible itching and vesicles, not the widely distributed pustules on the trunk seen with erythema toxicum neonatorum.