No. A lump can occur in any part of the body which may or may not contain cancer cells. Some of these lumps may grow to large sizes and produce ulcers. Because of this, they interfere with normal functions of nearby organs. However, they will not cause death and they can easily be removed by surgery and usually will not recur. They donot spread to other parts of the body. Such tumours are known as Benign tumours ie. harmless tumours. Cancer also can occur asa lump or tumour. A cancer is known as a malignant tumour. It is characterised specially by its potential to spread to other sites and to infiltrate the organ.