Hives and rashes are two skin conditions that can look fairly similar. Here, experts explain the difference between hives and a rash, plus treatments.

That summer was the last time I felt normal in my skin — then the rashes appeared. It was a few months into my freshman year of high school, I noticed small, red rings forming on my right arm.

Amelia Brown got her first Moderna shot in California on January 11, and her injection arm felt itchy a week later, she told Insider. The morning after the itchiness started, her upper arm was red ...