ANSWER: ✅ Pityriasis rosea (P.rosea) On the basis of the finding of a… — Family Medicine notes

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Family Medicine notesA previously healthy 42-year-old man presented with a 20-day history of an expanding, asymptomatic rash on his trunk. The initial lesion had been a red spot on the patient’s left side. 10 days after that spot had first appeared, smaller lesions had developed…

ANSWER: ✅ Pityriasis rosea (P.rosea)

On the basis of the finding of a “herald” patch in the patient’s midaxillary line on the left side, a diagnosis of pityriasis rosea was made. Pityriasis rosea is a self-limiting disorder that typically affects children, adolescents, and young adults. The cause of pityriasis rosea remains unclear. It may be related to viral reactivation of human herpes virus 6 or 7.

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The New England Journal of Medicine

September 4, 2025 | NEJM

Image Challenge from the New England Journal of Medicine — September 4, 2025