A focal point is a lesion that is confined to a smaller area. Focal is a common medical term for a lesion that is confined to a small area, surrounded by tissues that are normal in structure and function, and not affected by the diseased tissue. Focal lesions can be found in a variety of diseases. In digestive diseases, focal fatty lesions in the liver can be seen in the early stage of fatty liver; in respiratory diseases, focal lung nodules can be seen in lung infections, tuberculosis and other diseases; in endocrine system, focal thyroid lesions can be seen in thyroid nodules, thyroid cysts and other diseases. Patients with focal lesions are advised to go to the hospital and ask the doctor to make a judgment, rather than making a blind judgment on their own.