What happens if syphilis is left untreated? ?

If left untreated, syphilis can eventually cause damage to the brain, nerves, eyes, heart, blood vessels, liver, bones, and joints. In extreme cases it can cause difficulty coordinating muscle movements, paralysis, numbness, gradual blindness, mental illness, and even death.

It is done the same as osmosis with a potato. If you know what that is.

I hope this helps.