77. Skin Cancer
Skin
cancer the abnormal growth of skin cells most often develops on skin exposed to the sun. But this common form of cancer can also occur on areas of your skin not ordinarily exposed to sunlight. There are three major types of skin cancer basal cell carcinoma, squamous cell carcinoma and melanoma.
Cancer that forms in the
tissues of the skin. There are several types of skin cancer. Skin
cancer that forms in melanocytes (skin
cells that make pigment) is called melanoma. Skin
cancer that forms in the lower part of the epidermis (the outer layer of the skin) is called basal cell carcinoma. Skin
cancer that forms in squamous
cells (flat
cells that form the surface of the skin) is called squamous cell carcinoma. Skin
cancer that forms in
neuroendocrine cells (cells that release
hormones in response to signals from the nervous system) is called
neuroendocrine carcinoma of the skin. Most
skin cancers form in older people on parts of the body exposed to the sun or in people who have weakened immune systems.
Anatomy of the skin showing the epidermis (including the squamous cell and basal cell layers), dermis, subcutaneous tissue, and other parts of the skin. Skin cancer that forms in the lower part of the epidermis (the outer layer of the skin) is called basal cell carcinoma. Skin cancer that forms in squamous cells.
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