In these 4 cases of patients who present with genital ulcers or lymphadenopathy, what is the most likely diagnosis? What is the next step in management? What are the causes of false positive RPRs? When is the FTA used? What is the best treatment for secondary syphilis? What is the best treatment for secondary syphilis in a pregnant woman who is allergic to penicillin? What is the best treatment for chancroid, for lymphogranuloma venereum, and for genital herpes?