Pityriasis rosea is a skin rash that classically begins with a single lesion.
USMLE® Step 1 style questions USMLE
USMLE® Step 2 style questions USMLE
A 19-year-old man comes to the clinic because of a rash that started as a single lesion a few days ago. It has since spread throughout his chest and back. The patient had an upper respiratory infection nine days ago. Physical examination shows salmon pink patches, as seen below. Both VDRL and FTA-AB tests are negative. Which of the following is the most likely diagnosis?