If you've experienced cold sores for a long period of your life, then it's likely that you've established what triggers them for you. Hims explained that if you're feeling stressed, under the weather, experiencing hormonal changes, or are sleep deprived, then you may get a cold sore.
However, UV rays may also mean you're more susceptible to a cold sore recurrence. While UV supplies you with much-needed vitamin D, it can also damage your skin. "Dry, cold weather, wind, and sun can cause your lips to dry out," board-certified New York City-based dermatologist, Dr. Debra Jaliman, told Bustle. "This makes them vulnerable to a cold sore outbreak."
Colgate noted that if you notice that long days in the sun leave you with cold sores, then you should try to find a hydrating lip balm with a high SPF to wear all day. You should also consider breaking up your days spent outside by going indoors.
Healthline explained that cold sores differ from blisters after burning your lips in a number of ways. The publication noted that cold sores are similar to ulcers and may leave lesions as they heal. Sunburn blisters are generally white, fluid-filled bumps. They're generally surrounded by red swelling.
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