In this diagnostic quiz: 3 photos of classic presentations of 3 different diseases in patients of 3 generations.
This and other slightly raised pink rimmed lesions had been present on the upper face of a 3-month-old girl for about 4 days. Clearing can be seen in the center of some of the papules. The only notable history is that the patient had been exposed to the family dog.
What caused this raised papule in a 3 month old child?