I have ptb and taking medicine for 4 months. i am worried when i get cured, that it will leave a scar on my lungs. how can i cure that?

You can't: But don't worry. Its the rare adult without some scar tissue in their lungs, just like its hard to go through life without some scrapes on your knees. Follow through on your treatment course, testing and doctors visits, and take care of yourself in other ways. You can still lead a normal, long healthy life if you are otherwise healthy.

Lung Scarring: Lung scaring from PTB (pulmonary tuberculosis) is in response to the inflammation from the infection. The sooner you are cured, the less scarring you will have. The lungs have tremendous reserve, so when treated promptly, your pulmonary function should remain good.