How do I know this is Tietze's and not Cancer?

I'm an 18 year old male and I've had numerous Tietze's-like swellings on my ribcage - however, I haven't yet gotten them diagnosed. It started as a traditional left-sided sternal lump two years ago, then more appeared at other joints. Now it appears that very tiny contained bumps have appeared on my collarbone and even the direct middle point of my chin. It is unclear if some portions of my rib bone on my sides have become affected as well. I believe this to be a bacterial infection as it was preceded by what was presumably either a UTI or Syphilis contraction.

The lumps that appear are hard, immovable, occasionally hurt, but stop growing immediately after they appear to a notable degree and become less painful as time goes on. I've also had lymph node pain on my armpits, under my chin, and abdomen, but those too have become far less painful and frequent. None of the swellings/lumps are noticeably visible aside from the ones on my lowest ribs where the skin is the thinnest. After 2 years of waiting this out, I haven't had any other health complications regarding unusual sicknesses or my other organs. Is there any good way to differentiate Tietze's/infection and a spreading cancer?

I intend to be inspected very soon, I just want to get as much information as I can before diving in.

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