Fibrotic lung lesions are usually not cancerous. Most of the fibrotic lung lesions appear as limited fibrotic lesions, which are fibrous lesions in the local lung tissue. These fibrous lesions are formed mainly due to the proliferation of fibroblasts in the local lung tissue after the treatment of some lung lesions. Fibrous lesions in the lung are traces left behind after the repair of lung lesions and are in a relatively static state and can exist permanently or can gradually form calcified foci, but they are not completely absorbed and do not become cancerous. Therefore, pulmonary fibrous lesions do not require treatment and do not cause clinical symptoms.