Medically reviewed by Casey Gallagher, MD Fact checked by Khara Scheppmann Armpit rashes can be caused by allergic reactions, ...

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.

For those who have experienced COVID arm rash, your healthcare provider may recommend getting the next shot in the other arm.

Some recipients of the Moderna COVID-19 vaccine have reported a red, welted rash that showed up days after they got their shots. This delayed skin reaction occurred in less than 1% of phase 3 ...

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

The rash and the itching might be due to an allergic reaction, and so waxing might be the culprit, but it's more likely that your anti-perspirant is to blame. Try switching from an aerosol to an ...