Fibrotic foci in the lungs generally do not matter, the causes of fibrotic foci in the lungs include tuberculosis, pulmonary fibrosis and so on, and the treatment includes medication such as immunosuppressant, surgical treatment and so on. 1. Tuberculosis: after Mycobacterium tuberculosis infection, local tissue changes such as congestion and edema, fibrin exudation, etc. After treatment, the inflammatory components in the lesion are absorbed, and the fibroblasts proliferate to eventually form the fibrous foci. Chemotherapy is the main treatment for TB and commonly used drugs include isoniazid and rifampicin. If chemotherapy is ineffective, it can be treated by surgery. 2. Pulmonary fibrosis: If the fibrous foci of the lungs are widely and diffusely distributed, especially in the lower part of both lungs, it often suggests interstitial fibrosis of the lungs, which is mainly manifested by dry cough and progressive dyspnea. Drug treatment includes prednisone, cyclophosphamide, nidanib, etc. If conservative treatment is ineffective, lung transplantation is the main treatment for end-stage. Appropriate drugs need to be selected under the guidance of the doctor. When patients experience discomfort, they should go to the hospital immediately.