Spot Dx — What’s this painful rash after an overseas trip?

Hamish, a 23-year-old retail worker, presents after one week of fever, myalgia and malaise. 

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Hamish, a 23-year-old retail worker, presents after one week of fever, myalgia and malaise. He also has a painful rash on the penis and pubis, which has been gradually worsening over the past five days.

Hamish had unprotected sexual encounters with men during a trip to China two weeks ago. He is usually very well, and his last STI screen three months ago was negative.