A nurse is caring for a newborn who was delivered by vacuum extraction and has swelling on his head that crosses the suture line. The newborn's mother asks about the swelling on her newborn's head. Which of the following responses should the nurse make?

D This is a Mongolian spot, which is found on many newborns. B This is a caput succedaneum, which is a collection of fluid from pressure of the vacuum extractor. C This is erythema toxicum, which is a transient allergic reaction that causes edema in the skin. A This is a cephalhematoma, which will resolve on its own in 3 to 5 days.