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The outer layer of skin, the epidermis, is made up of different types of cells. Skin cancers are classified by the types of epidermal cells involved: Basal cell carcinoma develops from abnormal growth of the cells in the lowest layer of the epider...
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To diagnose skin cancer, doctors must carefully examine the lesion and ask the patient how long it has been there, whether it itches or bleeds, and other questions about the patient's medical history. If skin cancer cannot be ruled out, a biopsy i...
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