Let’s start with a ‘mini’ form of a benign growth—warts. When the wart virus gets into cells it changes their internal structure so that they keep multiplying in an unnecessary and disorderly fashion. This forms the lump which we know as a wart. However, the wart doesn’t keep on and on growing—it stops after a while. A wart is actually a very minor form of a benign growth. We use the word benign for growths that are not capable of causing much harm and are composed of cells which are similar to their cell of origin. If we looked at the wart cells under the microscope we would see that they looked pretty similar to normal skin cells, but they would not be quite as well differentiated. There is some control over the growth of these cells, they cannot damage nearby normal cells and they cannot spread to far distant parts of the body through the blood or lymph system.
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