Cancer Cells

Posted in Learn About Skin Cancer

Cancer begins in cells, the building blocks that make up tissues. Tissues make up the skin and other organs of the body. Normal cells grow and divide to form new cells as the body needs them. When normal cells grow old or get damaged, they usually die, and new cells take their place. But sometimes this process goes wrong. New cells form when the body doesn't need them, and old or damaged cells don't die as they should. The buildup of extra cells often forms a mass of tissue called a growth or tumor. Growths on the skin can be benign (not cancer) or malignant (cancer). Benign growths are not as harmful as malignant growths.

Benign growths (such as moles):

  • Are rarely a threat to life
  • Generally can be removed and usually don't grow back
  • Don't invade the tissues around them
  • Don't spread to other parts of the body

 Malignant growths (such as melanoma, basal cell cancer, or squamous cell cancer):

  • May be a threat to life
  • Often can be removed but sometimes grow back
  • May invade and damage nearby organs and tissues
  • May spread to other parts of the body

National Cancer Institute: What You Need To Know About™ Melanoma and Other Skin Cancers

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