Reactivation of a BCG Vaccination Scar Following the First Dose of the Moderna COVID-19 Vaccine.

The devastating effects of the COVID-19 pandemic have prompted rapid development and distribution of multiple vaccines. A 2-dose messenger RNA (mRNA) vaccine developed by Moderna (Moderna COVID-19 Vaccine) was approved in December 2020 for the prevention of COVID-19. We describe a case of BCG vaccination scar reactivation in a 48-year-old man after he received the first dose of the Moderna COVID-19 Vaccine.