Clinical Poll: What Is This Blister?
A 5-year-old girl presented with a 3-day history of a blister on her right thumb. She denied any discharge, trauma, insect bite, and fever. She had no known sick contacts, but she had experienced a similar lesion on her thumb 3 months ago, which had resolved. Physical examination revealed a bulla on the dorsal aspect of the right thumb with surrounding erythema. What diagnosis would you give this patient?