Read your post and felt I had to reply. I have had Linea Morphea for 20+ years and I know it was original caused by a hit with a bat to my head (accident while playing sport) I had a wound on the spot that would not heal and slowly over time developed morphea, took years to be finally diagnosed.
Recently I have developed scleroderma like symptons and have had many tests (still not fully diagnosed) ANA 400. I have had many problems in the last 4/5 years with gum infections and I have one spot that is a small lump in my gum that is always there but only causes problems occasionally its like my body excepts it.
( I've had many antibiotics) I have therefore always thought that in my case that my illness has been triggered by infection. How to stop it for me, is the question?
I think often there are different triggers for different people.
Best of luck to you,