Does syphilis always look like a bump, or can it cause different diseases?

Many symptoms. You get syphilis through unsafe sex. It can cause a painless ulcer on your genitals. But it can also cause a rash, fever, large lymph nodes, many other symptoms. It can also lead to other more serious complications. If you think you may have a sti, get tested!
See below. There are 3 stages of syphilis: primary (starts about three weeks after exposure, a painless sore called a chancre appears on the genitals, rectum, anus, or mouth); secondary (occurs ~two weeks to two months after the appearance of the painless sores, a non-itchy red or reddish-brown spotty rash may appear anywhere on the body); and late (which can start anytime from one year to several decades).