ST BARTHOLOMEW'S HOSPITAL / SCIENCE PHOTO LIBRARY. ST BARTHOLOMEW'S HOSPITAL / SCIENCE PHOTO LIBRARY.
Young girl with Herpes simplex, or cold sore, on the edge of the upper lip. H. simplex is an inflammation of the skin caused by a virus & is characterised by small blisters. Many people contact the virus without showing any symptoms. Those who show symptoms may find that it recurs over time.
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