Many more pictures at: Hardin MD : Cold Sores | Picture Gallery
These pictures & accompanying information are from the Public health image library database (PHIL) of the US Centers for Disease Control (CDC). See below for more information on searching PHIL. Click links below to go to full-size pictures & text information.
To do the search that retrieves these pictures, go to PHIL & search for cold sore. All of the pictures from that search are included here.
The text information with each picture is the same as in CDC/PHIL; the CDC database also provides a link to a high-resolution publication-quality version for each picture (very large files).