Syphilis is a sexually transmitted disease (STD) caused by a kind of bacteria Treponema palladium. Some people call it "The great imitator" because the singes of syphilis are indistinguishable from those of other disease. It can also can be spread through usage of the same needle by more than one person.
(Cite: http:herpes-coldsores.com/std/syphilis_pictures.htm )
