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Basal-cell carcinoma (BCC), also known as basal-cell cancer, basalioma [7] or rodent ulcer, [8] is the most common type of skin cancer. [2] It often appears as a painless raised area of skin, which may be shiny with small blood vessels running over it. [1] It may also present as a raised area with ulceration. [1]
Skin cancer is the most common form of cancer, globally accounting for at least 40% of cancer cases. [5] [20] The most common type is nonmelanoma skin cancer, which occurs in at least 2–3 million people per year. [6] [21] This is a rough estimate; good statistics are not kept. [1]
It is a rare type of skin cancer, with a 2013 incidence of only 0.7 per 100,000 persons in the U.S. [56] As of 2005, roughly 2,500 new cases of MCC are diagnosed each year in the United States, [56] as compared to around 60,000 new cases of malignant melanoma and over 1 million new cases of nonmelanoma skin cancer. [57]
More than five million nonmelanoma skin cancers are diagnosed annually in the U.S., and an estimated 207,390 cases of melanoma will be diagnosed in 2021. Every hour more than two people die from skin cancer. [6] [7] The primary cause of skin cancer is ultraviolet (UV) radiation from the sun and indoor tanning beds. [8]
Melanoma is the most dangerous type of skin cancer; it develops from the melanin-producing cells known as melanocytes. [1] It typically occurs in the skin, but may rarely occur in the mouth, intestines, or eye (uveal melanoma). [1] [2] In women, melanomas most commonly occur on the legs; while in men, on the back. [2]
Cutaneous squamous-cell carcinoma is the second-most common cancer of the skin (after basal-cell carcinoma, but more common than melanoma). It usually occurs in areas exposed to the sun. Sunlight exposure and immunosuppression are risk factors for SCC of the skin, with chronic sun exposure being the strongest environmental risk factor. [26]