What are Epstein's pearls?

Epstein's pearls are small, white epithelial cysts that commonly appear in a baby's mouth, particularly on the gums and the roof of the mouth (palate). These cysts are harmless and occur due to trapped epithelial cells during the development of the fetus. They usually resolve on their own within weeks without requiring any treatment.

Understanding this, it's clear that while the other options describe various skin or mucosal presentations, they do not accurately reflect the nature or location of Epstein's pearls. The white spots on the diaper area refer to a different condition, blue spots on the buttocks may point to conditions like Mongolian spots, and a red rash on the face could suggest several dermatological issues, but none of these pertain to the cysts found in the mouth that characterize Epstein's pearls.