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The two most common kinds of skin cancer are basal cell carcinoma and squamous cell carcinoma. (Carcinoma is cancer that begins in the cells that cover or line an organ.) Basal cell carcinoma accounts for more than ninety percent of all skin cancers in the United States. It is a slow-growing cancer that seldom spreads to other parts of the body. Squamous cell carcinoma also rarely spreads, but it does so more often than basal cell carcinoma. However, it is important that skin cancers be found and treated early because they can invade and destroy nearby tissue.

is a two-step procedure that is done on an outpatient basis. You will be injected with a light-activated drug, which targets cancerous cells. Approximately 24-48 hours later, a laser light is directed through a scope onto tumor cells, exposing the cancerous tissue to a certain spectrum of light. The light "switches on" the drug, destroying the cancerous cells without damaging your surrounding healthy tissue.

Malignant melanoma is usually signaled by a change in the size, shape, or color of an existing mole, or as a new growth on normal skin. Watch for the "ABCD" warning signs of melanoma: Asymmetry-a growth with unmatched halves; Border irregularity-ragged or blurred edges; Color-a mottled appearance, with shades of tan, brown, and black, sometimes mixed with red, white, or blue; and Diameter- a growth more than 6 millimeters across (about the size of a pencil eraser), or any unusual increase in size.

The most common warning sign of skin cancer is a change on the skin, especially a new growth or a sore that doesn't heal. Skin cancers don't all look the same. For example, the cancer may start as a small, smooth, shiny, pale, or waxy lump. Or it can appear as a firm red lump. Sometimes, the lump bleeds or develops a crust. Skin cancer can also start as a flat, red spot that is rough, dry, or scaly.

Skin cancer is the most common form of human cancer. It is estimated that over 1 million new cases occur annually. The annual rates of all forms of skin cancer are increasing each year, representing a growing public concern. It has also been estimated that nearly half of all Americans who live to age 65 will develop skin cancer at least once.

The group found this sequence by studying skin samples from 12 children with RDEB. They used laboratory tools to activate molecular switches that normally turn skin cells cancerous. What they found was surprising. Four of the 12 samples never turned cancerous, no matter what cancer-promoting molecular switches the researchers had flicked. The remaining eight samples became cancerous much like normal skin cells that the researchers had studied previously.