The mother of a 4-day-old calls the pediatrician's office because she is concerned about her infant's skin. Which finding needs to be reported promptly to the child's pediatrician?

A. There is a small pink patch on the left eyelid and one on the neck: Small pink patches, such as nevus simplex (stork bites), are common in newborns and typically fade without intervention. These are benign and do not require prompt reporting. B. Skin is peeling on several parts of the infant's body: Skin peeling is common in full-term newborns during the first week of life due to shedding of the outer epidermis. It is a normal finding and does not usually indicate illness. C. Today, the infant's skin has a yellowish tinge: Jaundice appearing or intensifying at 4 days of age can indicate hyperbilirubinemia that may require evaluation and treatment. Prompt reporting is necessary to prevent complications such as kernicterus. D. The hands and feet feel cooler than the rest of the body: Peripheral coolness is common in newborns due to immature circulation and is typically not a sign of serious illness unless accompanied by other symptoms such as lethargy or central cyanosis.