Channel your inner Dr. Meredith Grey, and imagine a patient complaining of itchiness, chafing, redness, and bumps under her arms that make it painful to move the upper body. What’s the diagnosis? Barring an invented-for-TV tropical virus, the most likely cause is an allergic reaction to deodorant. But really, is there such a thing as a deodorant allergy?

Before you freak out that you’re doomed to stink forever, here’s the good news: it’s impossible to be allergic to all deodorants because they come in so many different sizes, formulas, and applications (ever tried deodorant in a tube?). However, you can become sensitive to certain ingredients that are commonly found in deodorants, and that sensitivity may lead to an allergic reaction.

Here’s what to know about the symptoms, causes, and treatment of an allergic reaction to deodorant.