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Nonmelanoma skin cancer usually develops slowly, invading and destroying nearby tissues. It may take months or years for basal cell or squamous cell carcinomas to develop. Because of this slow growth, skin cancer can often be detected and treated early in its development, increasing the chance for a cure.
Basal cell carcinoma
Basal cell carcinoma can invade normal skin tissue and damage deeper tissues, such as muscles and bones, and affect the appearance of the skin. Basal cell carcinoma very rarely spreads (metastasizes) to other parts of the body.
After you have one basal cell carcinoma, you are more likely to have another one develop in a new place. If basal cell carcinoma comes back at the same place (recurs), it may grow faster and cause more tissue damage.
Squamous cell carcinoma
Squamous cell carcinoma is more invasive than basal cell and can spread from the scalp, ears, eyelid, nose, or lip to other areas of the body. But it rarely spreads (metastasizes) to other parts of the body.
Sometimes a squamous cell carcinoma starts as actinic keratosis, which are small rough spots that grow in sun-damaged skin. Actinic keratosis is not a skin cancer, but it may lead to skin cancer.
| By: | Healthwise Staff | Last Revised: October 1, 2010 |
| Medical Review: | Kathleen Romito, MD - Family Medicine Randall D. Burr, MD - Dermatology | |
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