When a protrusion appears in front of the sternum, the first thing to consider is whether it is a local bone with a bulging deformation or a local soft tissue with a protrusion. The soft tissues in front of the sternum are relatively thin, and once there is a soft tissue swelling, such as lipoma, powder tumor, etc., the texture is generally soft. If the skeleton in front of the sternum is protruding, the texture of the protruding part is relatively hard. If the protruding part is pushed by hand, it can generally move appropriately if it is a soft tissue protruding swelling, but if it is a skeletal protruding swelling, it is generally not able to move significantly. If it is a skeletal protrusion, it is most likely due to the deformation of the fibrocartilage of the lateral sternum or the local cartilage of the adjacent sternoclavicular joint, which is mostly directly related to the external force on the chest, the compression of the chest, and the long-term strain on the chest.