title: Atypical primary syphilitic lesions on the penis.
mesh_terms: D006801:Humans; D008297:Male; D008853:Microscopy; D009092:Mucous Membrane / Q000382:microbiology / Q000473:pathology*; D010409:Penile Diseases / Q000473:pathology*; D010413:Penis / Q000473:pathology*; D012867:Skin / Q000382:microbiology; D013588:Syphilis Serodiagnosis; D013591:Syphilis, Cutaneous / Q000473:pathology*; D014210:Treponema pallidum / Q000302:isolation & purification