This rash on a teenage boy's palms began on his hands and spread to his torso and upper and lower extremities over several days. He had no pain or pruritus. Two weeks before the lesions appeared, he had experienced fatigue, fever, and myalgia of 1 week's duration.
Six months after testing positive for HIV in 10 bands, a 24-year-old homosexual man presented with a macular rash on his palms and soles. The presentation seen here is typical of what sexually transmitted infection?