* Skin cancer is the most common form of cancer in the US
* Each year there are more new cases of skin cancer than the combined incidence of breast, prostate, lung and colon cancers.
* 1 in 5 Americans will develop skin cancer in the course of a lifetime.
* Over the past 31 years, more people have had skin cancer than all other cancers combined.
The most important warning sign for melanoma (skin cancer) is ANY change in size, shape, or color of a mole or other skin growth, such as a birthmark. Watch for changes that occur over a period of weeks to a month. Use the ABCDE rule to evaluate skin changes, and call your health professional if you have any of the following changes.
A is for asymmetry: One half of the mole or skin growth doesn't match the other half.
B is for border irregularity: The edges are ragged, notched, or blurred.
C is for color: The pigmentation is not uniform. Shades of tan, brown, and black are present. Dashes of red, white, and blue add to the mottled appearance.
D is for diameter: The mole or skin growth is larger than 6mm or about the size of a pencil eraser. Any growth of a mole should be of concern.
E is for evolution: There is a change in the size, shape, symptoms, surface, or color of a mole.
Melanoma can develop in an existing mole or other mark on the skin, but it often develops in unmarked skin. Although melanoma can grow anywhere on the body, it often occurs on the upper back of men and women and on the legs in women. Less often, it can grow on the soles, palms, nail beds, or mucous membranes such as the mouth, rectum, and the vagina. On older people, the face is the most common place for melanoma to grow. In older men, the most common sites are the neck, scalp, and ears.
source. www.webmd.com