Diagnosis is costochondritis but i have no pain. lump starts at underside of collar bone. also several harder lymphnodes in my groin, jaw, ear areas?

COSTOCHONDRITIS IS: Caused by virus mostly. As a part of viral illness, there can be lymph node enlargement at different parts of the body. We have groups of lymph nodes allover our body, like check points to catch bacteria/viruses, they get swollen, kills the germs and over time comes back to their normal small, non-palpable size. Unless you have any other issues (e.g. Unprotected sex/std), you will be ok.