Hi.Tietze's is self limiting
Hello.Welcome and thanks for writing us on XXXXXXX
I have thoroughly read your query and deeply understand your concern.
Tietze is self limiting and completely benign.This can never turn into a tumor
If your left collar bone is swollen and painful this can be Tietze and this subsides with adequate rest and taking analgesic
.If your pain is not subsiding with pain killers consult your doctor so that he can put you on a course of steroids
and this gives adequate pain relief.
Normally though pain usually subsides within a few weeks, with some residual swelling persists for longer periods of time.The course of the disease varies from spontaneous (disappears by itself) remission to persistent symptoms over years.
Hope this answers your query.
Get well soon.There is no need to pain.