Hello and Welcome to ‘Ask A Doctor’ service. I have reviewed your query and here is my advice. The scar in a lung generally is a harmless condition and might be due to an old and healed infection and does not signify any active disease process. It can be due to an old pulmonary tuberculosis that went unnoticed. It takes very long time to resolve completely and no definite treatment is required. You can go for an HRCT (High Resolution CT) thorax for a better clinical picture. You can consult a pulmonologist in case of HRCT shows any suspicious lesions. Hope I have answered your query. Let me know if I can assist you further.