If you perform a chest X-ray or chest CT examination, you can often see on the report sheet that there are a few fibrotic lesions on the lungs. A few fibrotic lesions on the lungs are often shadows left after the original pneumonia, tuberculosis or bronchitis and other diseases have improved, and these shadows are often proliferative lesions with high density, which are generally not absorbed by the lungs, and can last for a long time, just like the usual scar formation, and generally have no major problems. There are no major problems. If the infection is frequent, bronchiectasis can form secondary to this, with symptoms such as coughing, coughing and even hemoptysis, but this is relatively rare. If a small fibrous lesion is found on the lung, it can be reviewed periodically.