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Which layers of the epidermis do cancers originate in, and why those layers specifically?

Which layers of the epidermis do cancers originate in, and why those layers specifically?

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Basal cell and squamous cell carcinoma is the most common type of skin carcinoma which occurs in the basal layer of epidermis. Epidermis is the outer layer of the skin, which has five sub layers. The basal layer of epidermis is called stratum basale and basal cell carcinoma of skin may occur as a result of too much exposure of sun light i.e. ultra violet exposure. Carcinoma starts developing when basal cells of the skin multiply very quickly. This type of skin carcinoma is commonly occurring in people more than 50 years of age.Since epidermis is the outermost layer of skin hence it is easily exposed to ultra violet rays which may be one of the most predisposing factors of skin carcinoma.

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