A black spot on the lung may be seen as an opaque spot on the lung during fluoroscopy, and it will show up as a black spot on the fluoroscope. In most cases, black dots on the lung are caused by some high-density foci in the lung, such as calcified foci in the lung, fibroproliferative foci in the lung, solid foci in the lung or atelectasis, lung tumors, sarcoidosis, and so on. It is important to know the cause of a specific disease, and it is not possible to give a specific treatment just for a black spot, but to find the cause of the black spot in order to treat it symptomatically, based on the patient’s symptoms, clinical manifestations and other laboratory tests in order to finally find the cause.