When Sun Triggers a Cold Sore: How to Protect Yourself This 'Sun Season'

The sun is shining, the temps are rising, and you’re finally breaking out your cute sunglasses and summer sandals—but wait... is that a tingle on your lip?

If you live with HSV-1 (aka cold sores), you might already know that too much sun can lead to an unwelcome outbreak. So, what’s the deal with sunshine and cold sores—and how can you still enjoy the season without feeling like you have to hide in the shade?

Let’s get into it.

Here’s the quick science:

UV (ultraviolet) rays from the sun can weaken your skin’s natural defenses and cause inflammation. When you have HSV-1, that sun stress can give the virus the signal to wake up from its hiding place in your nerve cells and cause an outbreak.

In fact, according to a study from the Journal of Investigative Dermatology, UV exposure is one of the top external triggers for cold sore reactivation. Even people who rarely get cold sores can suddenly have one after a long beach day or skiing at high altitudes.

The good news? You can still soak up the good vibes without inviting an outbreak. Here's how:

Your lips are delicate and prone to sun damage, which makes them extra vulnerable if you're HSV-positive. Keep a protective balm like the Lifesaver SPF Lip Balm on hand. It’s packed with CBD, lysine (a cold sore-fighting amino acid), and peppermint oil for an extra soothing feel. Reapply every 2 hours, especially if you’re eating, drinking, or swimming.

Between 10 a.m. and 4 p.m., UV rays are at their strongest. Plan your time outdoors earlier or later if you can—or rock that wide-brimmed hat and big sunglasses look to help protect your face.

Add some lysine-rich foods to your plate—like eggs, chicken, quinoa, and yogurt—and consider a lysine supplement during sunny months. At the same time, avoid too much arginine (found in chocolate, nuts, and oats), which can support viral replication.

Sun exposure isn’t just physical—it can also lead to dehydration, fatigue, and stress, which are cold sore BFFs. Hydrate often, rest well, and practice calming routines like journaling or short meditations. If you feel your immune system needs a kick, we recommend taking these supplements to keep your immune in top shape!

Having HSV doesn’t mean you have to dread summer—it just means you take a few extra steps to care for your skin and your immune system. It’s not about hiding from the sun; it’s about being prepared.

So yes, pack that beach bag, plan the poolside brunch, go on that weekend hike. Just toss in your SPF lip balm, drink your water, and know that you're doing all the right things to protect yourself.