A 3-week-old infant presents with multiple pustules on his face.
Lesions have been present for one week and do not appear to bother
the infant.
The child was born via uncomplicated vaginal delivery at 39
weeks. The mother did not receive prenatal care until 22 weeks of
pregnancy, when she realised she was pregnant. She is worried that
her child might have "caught something" from a sick
sibling at home.
On physical examination, the child is well appearing, but there
are multiple pustules distributed on the forehead, nose and
bilateral cheeks.
What is the diagnosis?