How to remove my lung scar so I can work?

Can't answer this. "lung scar" can mean a lot of things, only a few of which should interfere with your ability to work. Many doctors refer to "lung scarring" when describing a condition called idiopathic pulmonary fibrosis. This can be a disabling condition that is progressive and largely untreatable. If you have this its best to go to a center that runs ipf clinical trials. Search google for one near you if so.