A 35-year-old woman from Mumbai presents with a maculopapular rash involving the trunk and extremities (including palms and soles) for 2 weeks. She also reports fever, generalized lymphadenopathy, and a history of a painless genital ulcer that healed spontaneously 8 weeks ago. RPR titre is 1:64 (positive). FTA-ABS is positive. What is the most appropriate next step in management?