It took a while to respond to the topical medication but he did respond to it. I was surprized!!
It was a bacterial infection
If it is only on his face, it’s not chickenpox. The tiny white pus centers does resemble why she would call it chickenpox. But chickenpox is a viral infection so it would be other areas as well. Any new soap? I would put cortisone on it and watch it for a couple days. Even calamine lotion but don’t get it right by the mouth.
Does he have any on his hands or feet? Could be hand foot mouth disease.
Glad to hear he's on the mend!