Even celebrities can get cold sores. Also known as fever blisters, they are identified as an infection with the herpes simplex virus around or on the lips. Cold sore outbreaks are often triggered by sun exposure, cold wind, the common cold, high stress levels, or a low immune system.
They can be difficult to cover up with makeup, so the celebrities below, like Kim Kardashian and Katie Holmes, have been photographed in public with an outbreak.
Scroll on to learn about more famous people who have dealt with cold sores.