I learned that when a physician examines an insane patient they always check for evidence of “tertiary lues”, a clue to the root cause of nutty behavior.
Evidently, crazy people with syphilis develop these tertiary lues, a visual clue to the root cause of schizophrenic behaviors.
In WWII, Syphilis and gonorrhea was a major concern, and I love the old WWII VD posters:
Syphilis was one rare, but this fatal form of crotch rot is making a comeback:
So what do tertiary lues look like?
Click the link for an image search for tertiary lues if you dare . . . .