Skin cancer is the most common form of human cancer. Skin cancer is the most common form of cancer in the United States. Skin cancer generally develops in the epidermis, the outermost layer of skin, so a tumor is usually clearly visible. There are three major types of skin cancer — basal cell carcinoma, squamous cell carcinoma and melanoma. Basal cell carcinomas and most squamous cell carcinomas are slow growing and highly treatable, especially if found early. Melanoma is the most serious form of skin cancer. It affects deeper layers of the skin and has the greatest potential to spread to other tissues in the body. Squamous cell carcinoma also can spread internally. 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. They usually form on the head, face, neck, hands and arms. Another type of skin cancer, melanoma, is more dangerous but less common. For localized melanoma, the 5-year survival rate is 99%; survival rates for regional and distant stage diseases are 65% and 15%, respectively.
Skin cancer is an increasingly common condition. This is in part attributed to increased exposure to ultraviolet radiation, which in turn is thought to be caused by the increased popularity of sun tanning. Solar or actinic keratoses are rough, red or brown, scaly patches on the skin. They are usually found on areas exposed to the sun, and sometimes develop into squamous cell cancer. Moles are clusters of heavily pigmented skin cells, either flat or raised above the skin surface. While most pose no danger, some-particularly large moles present at birth, or those with mottled colors and poorly defined borders-may develop into malignant melanoma. Moles are frequently removed for cosmetic reasons, or because they’re constantly irritated by clothing or jewelry. Skin cancer develops primarily on areas of sun-exposed skin, including the scalp, face, lips, ears, neck, chest, arms and hands, and on the legs in women. There are varieties of treatments available, including surgery, radiation therapy, and chemotherapy, to treat skin cancer.