Final answer:
The pale pink vascular macule in the nuchal area and face that becomes more red when the baby is angry is consistent with nevus simplex or stork bite.
Step-by-step explanation:
The symptoms described in the question, such as a pale pink vascular macule in the nuchal area and face that becomes more red when the baby is angry, are consistent with a condition called nevus simplex or stork bite. It is a type of birthmark that is caused by a cluster of blood vessels close to the skin's surface. The lesions on the face tend to disappear over time, while the ones in the nuchal area persist.