A 38-year-old man presented with a 2-week history of a firm, painless ulcer on the glans
penis. He had recently returned from a 3-month trip to Thailand, China, Hong Kong and
Australia. He was otherwise well.
Examination revealed an ulcer as described by the patient, with no associated
lymphadenopathy.

What is the most likely diagnosis?

Answer rating: 100% (QA)

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