Pulmonary fibrotic foci are not cancer. Pulmonary fibrotic foci are formed due to collagen tissue repair at the site of the lesion after lung infection. Lung fibrotic foci are the foci left after the natural healing of lung infection, clinically there are mostly no obvious symptoms, a few patients may appear irritating dry cough, or even chest tightness and dyspnea. Fibrotic foci in the lungs can usually be treated with bronchodilator drugs such as salbutamol aerosol. If the symptoms have a tendency to deteriorate, it is recommended that the patient go to a regular hospital in time to register, under the guidance of a specialist to clarify the cause of the disease and timely treatment.