Some people are having a delayed reaction to Moderna's COVID-19 vaccine. Should you be concerned?

This morning, News 12's Elizabeth Hashagen was joined by Dr. Joseph Petrosino to talk about the new guidelines from the Centers for Disease Control and Prevention for fully vaccinated people and reactions to the Moderna vaccine. Dr. Petrosino is the chairperson of the Department of Molecular Virology and Microbiology Baylor College of Medicine.
Does this mark a turning point in the pandemic? Dr. Petrosino talks about this first step to returning to normal:
There are now more than 31 million people in the United States who are fully vaccinated, and more than 60 million have received one dose. But the United States still averaged more than 60,000 cases per day over the last seven days, according to Johns Hopkins University.
Dr. Petrosino talks about how we can outpace the new variants:
Some people who have received the Moderna COVID-19 vaccine are having a delayed reaction that causes a red and sometimes bumpy rash on the arm. The New England Journal of Medicine published numerous photos of what some of the so-called "COVID arm" rashes look like.
The CDC says these patients should still receive the second dose using the same type of COVID-19 vaccine, but preferably in the opposite arm.
How concerned should people be if they get this reaction? Dr. Petrosino talks about these cases: