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Course: Urticaria 12 Days After COVID-19 mRNA Booster Vaccination

CME Credits: 1.00

Released: 2022-04-14

A healthy 27-year-old woman received a COVID-19 mRNA booster vaccine (Moderna) on December 7, 2021. She had not experienced adverse effects after the first 2 vaccine doses on January 17 and February 5, 2021. Twelve days after the booster vaccination, she developed pruritic wheals on her face and bilateral, transient eyelid swelling. Over the next week, a pruritic rash spread over her neck, chest, trunk, and arms; each lesion faded without scarring within 24 hours. She did not experience lip, tongue, or neck swelling; shortness of breath; wheezing; chest pain; or palpitations. Application of pressure to her forearm in a circular motion using a pen cap elicited wheal and flare lesions (, left panel). On physical examination, performed 17 days after the onset of rash, her vital signs were normal. She had no tongue, lip, or throat swelling, and her lungs were clear to auscultation bilaterally. Wheal and flare lesions developed on her upper eyelids during the examination and resolved after approximately 30 minutes (, right panel). Light pressure applied to her skin with a tongue depressor elicited wheal and flare lesions within 3 to 5 minutes.


Educational Objective
Based on this clinical scenario and the accompanying image, understand how to arrive at a correct diagnosis.


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