An unusual case of seronegative secondary syphilis (case report).
D000328:Adult; D003937:Diagnosis, Differential; D006801:Humans; D008297:Male; D012867:Skin / Q000473:pathology; D013587:Syphilis / Q000175:diagnosis* / Q000473:pathology; D013588:Syphilis Serodiagnosis; D013591:Syphilis, Cutaneous / Q000175:diagnosis* / Q000473:pathology