What Are Cold Sores? Symptoms, Causes, Diagnosis, Treatment, and Prevention

Cold sores are small, painful blisters that usually form on or around the lips. These small fluid-filled blisters are sometimes called fever blisters or oral herpes. (1) Cold sores are highly contagious and can be spread through saliva or skin contact. This is a common condition, some people have the first outbreak during childhood. (2) …

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