Is a large hard growth on the back cancer, it is a possibility, there are several possibilities for a large growth on the back, it could be a benign tumor or a malignant tumor. Cancer is a malignant tumor, but of course it can also be caused by dysplasia. For example, congenital scoliosis, idiopathic scoliosis, the etiology of which is not clear, scoliosis, back on one side of a large bulging bag, the other side of the depression, because of scoliosis, the bones bulge, the top of the soft tissues, appear to have a large bag, but not the growth of a mass. If it is malignant (the so-called cancer), usually grows faster, early pain may appear, the first may be manifested in the night pain, the gradual development of persistent pain. Generally, blood flow is richer, superficial veins may be varicose, superficial veins are seen to be full, and the skin temperature is warmer to the touch. Because of rapid growth, infiltration, and unclear boundaries of the surrounding tissues, induration is positive. If it is a benign mass, the growth and development is very slow, the pressure pain is not so obvious, the tissue boundaries are clearer, and there is no manifestation in the early stage, and it may grow very large and compress the surrounding soft tissues before some symptoms such as pain appear.