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Several cutaneous reactions to Moderna (83%) or Pfizer (17%) COVID-19 vaccines were reported by McMahon et al. for 414 unique patients.1 The most common cutaneous reaction was delayed large local reaction, followed by local injection site reactions, urticaria, morbilliform eruptions, erythromelalgia, and pernio/chilblains. Dear Editor In December 2020 the FDA authorized Pfizer/BioNTech (BNT162b2) and Moderna (mRNA-1273) COVID-19 vaccines. We report two cases of "COVID arm": a localized erythematous reaction at the injection site after the first administration of Moderna COVID-19 vaccine.2 None of them had COVID-19 infection symptoms prior to their COVID-19 vaccinations and the onset of their skin rash. [Extracted from the article]