A man is taking a shower and notices this lesion on his penis that is not tender but is firm with a clean surface and raised edges.He is quite dismayed, so he goes to his physician.The physician does a rapid plasmin reagin (RPR) and a darkfield microscopy.Both tests are positive.What is the physician's probable diagnosis?

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The primary syphilis lesion develops 10 to 90 days after infection and is a result of an inflammatory response to the infection at the site of the inoculation.The lesion, known as the chancre, is typically a single erythematous lesion that is not tender but is firm with a clean surface and raised border.The lesion is teeming with treponemes and is extremely infectious.

A Man Is Taking a Shower and Notices This Lesion