Pulmonary exanthematous nodules are simply pathological manifestations of the lung for a variety of reasons, the vast majority of which are benign solid nodules, most commonly inflammatory pseudotumors, which are fibrotic, calcified lesions left behind as a result of lung infections. For example, due to infection by pathogens such as bacteria, Mycobacterium tuberculosis, fungi, and protozoa, leptospira, and pulmonary schistosomes, and the inflammation completely subsides, leaving a varying number of solid nodules in the lungs after healing. It is also seen in solid nodules due to the pollution of the working and living environment and the inhalation of tiny dust particles that enter the lungs and are deposited, causing pneumoconiosis and silicosis. There are also small nodules in the lungs of unknown origin, which generally do not affect normal life and work, do not have any clinical symptoms, and only need to be reviewed and do not require special treatment. However, a very small percentage of solid nodules are malignant occupying lesions in the lung, which is bronchopulmonary cancer. It requires early surgery after clear diagnosis, as well as treatment with radiotherapy and chemotherapy.