More information has emerged about “COVID arm” — a delayed arm rash appearing after Moderna’s COVID-19 vaccine is administered — including likelihood, duration and treatment.

A small study published in March found some recipients of Moderna’s COVID-19 vaccine experienced delayed rashes. Another study, published May 12 in JAMA Dermatology and led by researchers from New Haven, Conn.-based Yale School of Medicine, provides more information about the condition. 

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