Primary Syphilitic Infection of the Finger
The chancre is usually firm, round, small, and painless, appearing at the spot where syphilis entered the body. It lasts three to six weeks and heals on its own. If adequate treatment is not administered, the infection progresses to the secondary stage.
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"Extragenital syphilitic chancre of the left index finger PHIL 4147 lores."
http://en.wikipedia.org/wiki/File:Extragenital_syphilitic_chancre_of_the_left_index_finger_PHIL_4147_lores.jpg
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