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BCC starts in basal cells that are found in the deepest layer of the epidermis. BCC is the most common type of skin cancer, making up about 75% of all non-melanoma skin cancers diagnosed. It mostly develops in sun-exposed areas, but it can develop anywhere. It is most often diagnosed in people who are middle-aged or older. It is rare for BCC to spread to another part of the body, but it is possible to have more than one BCC at a time. Having one BCC increases your risk of getting another.
There are different subtypes of BCC:
The micronodular, infiltrative and morpheaform (sclerosing) subtypes of BCC are more aggressive than the nodular or superficial forms.