This topic is about
basal cell cancer and
squamous cell cancer. For information about
melanoma skin cancer, see the topic
Skin Cancer, Melanoma.
Skin cancer is the abnormal growth of cells in the skin. It is the most
common type of cancer. It is almost always cured when it is found early and
treated. So it is important to see your doctor if you have changes in your
Most skin cancers are the nonmelanoma type. There are two
main types of nonmelanoma skin cancer:
- Basal cell carcinoma. Most nonmelanoma
cancers are this type. It can damage deeper tissues, such as muscles and bones.
It almost never spreads to other parts of the body.
- Squamous cell carcinoma. This type is
less common. It often develops from a small rough spot that grows in sun-damaged skin. It
sometimes spreads to other parts of the body.
There are other types of skin cancer that are not melanoma. But these are much less common. They include Merkel cell carcinoma and several kinds of sarcomas.
Nonmelanoma skin cancer is usually
caused by too much sun. Using tanning beds or sunlamps too much can also cause
cancer usually appears as a growth that changes in color, shape, or size. This
can be a sore that does not heal or a change in a mole or skin growth. These changes
usually happen in areas that get the most sun—your head, neck, back, chest, or
shoulders. The most common place for skin cancer is your nose.
Your doctor will use a
biopsy to find out if you have skin cancer. This means
taking a sample of the growth and sending it to a lab to see if it contains
The single greatest risk is from ultraviolet (UV) radiation. This comes from exposure to the sun, especially during the middle of the day. It also comes from exposure to artificial sources of UV, such as indoor tanning.