(Nonmelanoma Skin Cancer)
Norman Levine, MD
Dr. Norman Levine, MD, is a dermatologist in active practice in Tucson, Arizona. He has authored four books about skin health and dermatology therapy and contributed to hundreds of articles, several book chapters, and even a CD-ROM. Dr. Levine is a reviewer of dermatological cases for Physicians' Review Network.
John P. Cunha, DO, FACOEP
John P. Cunha, DO, is a U.S. board-certified Emergency Medicine Physician. Dr. Cunha's educational background includes a BS in Biology from Rutgers, the State University of New Jersey, and a DO from the Kansas City University of Medicine and Biosciences in Kansas City, MO. He completed residency training in Emergency Medicine at Newark Beth Israel Medical Center in Newark, New Jersey.
- What is skin cancer?
- What are the risk factors for skin cancer?
- What causes skin cancer?
- What are the different types of skin cancer?
- What are the signs and symptoms of skin cancer?
- When is a mole dangerous or high-risk for becoming a skin cancer?
- What are the most common sites where skin cancer develops?
- How is skin cancer diagnosed?
- What is the staging for skin cancer?
- What is the treatment for skin cancer?
- What is the prognosis for skin cancer?
- Can skin cancer be prevented?
- Sunscreen use and vitamin D
- Pictures of Skin Cancer Signs - Slideshow
- Take the Skin Cancer Quiz
- Pictures of Sun-Damaged Skin - Slideshow
- Skin Cancer (Melanoma) FAQs
- Find a local Dermatologist in your town
What is skin cancer?
Skin cancer is a common, usually low-grade cancerous (malignant) growth of the skin. It starts from cells that begin as normal skin cells and transform into those with the potential to reproduce in an out-of-control manner. Unlike other cancers, the vast majority of skin cancers have no potential to spread to other parts of the body (metastasize) and threaten your life.
There are two major types of skin cancer, basal cell carcinoma (the most common) and squamous cell carcinoma (the second most common). Melanoma is also a form of skin cancer but is far less common, though more dangerous, than the other two varieties.
What are the risk factors for skin cancer?
The most common risk factors for skin cancer are as follows.
- Ultraviolet light exposure, either from the sun or from tanning beds: Fair-skinned individuals with a history of repeated sunburns, those with hazel or blue eyes, and people with blond or red hair are particularly vulnerable. The problem is worse in areas of high altitude or near the equator where sunlight exposure is more intense.
- A chronically suppressed immune system (immunosuppression) from underlying diseases such as HIV infection or cancer, or from some medications such as prednisone or chemotherapy
- Exposure to ionizing radiation (X-rays) or chemicals known to predispose to cancer such as arsenic
- Certain types of wart virus infections
- People who have a history of one skin cancer have a 20% chance of developing a second skin cancer in the next two years.
Next: What causes skin cancer?
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