The Polymorphous Rite of Spring

Spring has arrived—at least in most parts of the Northern Hemisphere—and with it comes a whole host of seasonal ailments. People are generally aware of irritant or allergic reactions caused by exposure to newly emerging plants and pollen, but one of the most characteristic but lesser-known rashes that happens as our exposure to sunlight increases with the change of seasons is the so-called polymorphous light eruption. Polymorphous means having many different forms, and this is the case with this rash, which can take on many different presentations—featuring itchy bumps, patches, or even blisters on areas typically exposed to the sun such as the chest, neck, and arms. For those who are unfortunate enough to develop it, it typically starts in the teens and early twenties and happens every year with the arrival of spring. The condition can become less of an issue after many years, but it is important to suspect and identify the diagnosis so that appropriate steps to minimize its presentation can be taken. Thankfully, there is a low risk of actual damage to the skin, but having it once necessitates careful sun protection to prevent it from showing up in its worst form. With severe cases, dermatologists will even use specifically tailored treatments with ultraviolet light to lessen the reactivity of the skin. 

Posted on March 22, 2026.