26th April 2024

A 35-year-old man, who is sexually active with multiple partners, presents with a 3-week history of generalised fatigue, intermittent fevers, and a non-itchy rash on his trunk and arms.

A 35-year-old man, who is sexually active with multiple partners, presents with a 3-week history of generalised fatigue, intermittent fevers, and a non-itchy rash on his trunk and arms. He also reports significant weight loss and occasional night sweats. He has no prior significant medical history and takes no regular medications.

On examination, he is afebrile, with a pulse rate of 88 bpm and BP of 115/75 mmHg. A maculopapular rash is noted on his trunk and upper limbs. There are also a few oral ulcers. His neck is supple with no lymphadenopathy, and the rest of the examination is unremarkable.

Which of the following is the most likely diagnosis?