Skin cancer is the uncontrolled growth and division of skin cells. The three main types of skin cancer are basal cell carcinoma (originates in the lowest layer of the skin), squamous cell carcinoma (originates in the middle layer of the skin), and melanoma (originates in the pigment-producing cells of the skin). All of these types of skin cancer are caused, at least in part, by long-term sun exposure. Skin cancer is the most common form of cancer in the United States.
Skin cancer is the most common type of cancer in the United States and is partly caused by long-term sun exposure. Fair-skinned people are at higher risk of developing skin cancer because their skin produces less melanin, which protects the skin from the sun's ultraviolet rays. However, dark-skinned people and people lacking significant sun exposure also develop skin cancer. The three main types of skin cancer are basal cell carcinoma, squamous cell carcinoma, and melanoma.
Basal cell carcinoma is the most common form of skin cancer. It originates in the lowest layer of the skin and usually develops in areas exposed to sunlight. Tumors usually begin as small, shiny, raised growths that enlarge slowly. Basal cell carcinoma rarely spreads to distant parts of the body.
Squamous cell carcinoma is skin cancer that develops in the middle layer of the skin and affects normal skin or skin damaged by sun exposure. Squamous cell carcinoma can grow anywhere on the skin, in the lining of the mouth, or on the tongue. Tumors begin as red areas with a crusty surface. These areas do not heal and become open sores. Most squamous cell carcinomas affect only the area around them but can spread to other parts of the body.
Melanoma originates in the pigment-producing cells of the skin, which give the skin its color. Nearly half of melanoma cases develop from existing pigmented moles. Unlike other forms of skin cancer, melanoma readily spreads to distant parts of the body. Once a melanoma grows deep into the skin, it is more likely to spread through the lymph and blood vessels.
The information provided in the Skin Cancer Condition Guide is not intended to be a substitute for professional medical advice. A licensed healthcare professional should be consulted for diagnosis of basal cell carcinoma, squamous cell carcinoma, or melanoma and treatment of any and all medical conditions.
