In performing its functions, the skin is helped by the hair, nerves, and glands within it. The skin has three main layers. The lower level is the subcutaneous fat. The middle level of connective tissue is the dermis. The thinnest, uppermost level is the epidermis.
Cancer is really a number of diseases caused by the abnormal growth of cells.
Normally the cells that make up the body divide and reproduce in an orderly manner, so that we can grow, replace worn-out body tissue, and repair injuries. Sometimes, however, cells get out of control, divide more than they should, and form masses known as tumors. Some tumors may interfere with body functions and need to be removed, but do not spread to other parts of the body. Generally, these are known as benign tumors. Malignant, or cancerous, tumors not only invade or destroy normal body tissue, but, by a process known as metastasis, cells can break away from the original tumor and go to other parts of the body.