A photograph of a primary syphilitic chancre of the lower lip due to Treponema pallidum bacteria.
A patient with a typical syphilitic chancre located on lower lip. A chancre is a small, painless red ulcer that develops during primary syphilis. Primary syphilis is characterized by one or more chancres after inoculation with T. pallidum bacteria.
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Some of the images on this website are in the public domain.