1st January 2024

A 60-year-old female known to have rheumatoid arthritis presents with a 4-day history of a worsening painful

A 60-year-old female known to have rheumatoid arthritis presents with a 4-day history of a worsening painful, blistering rash on her right forehead, which was preceded by paraesthesia in that area. She has significant periorbital swelling on that side and has difficulty opening her eyes. She has recently had a course of steroids for a flare-up of her condition. On examination, she has a blistering vesicular rash from her scalp to the tip of her nose on the right, respecting the midline. What is the most likely diagnosis?

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