The majority of skin cancer can be prevented by careful sun protection, including sunscreens, from an early age. Taking nicotinamide (vitamin B3) can reduce the numbers of nonmelanoma skin cancers. Skin cancers are detected early by regular self skin examination and skin checks by a trained health practitioner. Mole mapping and dermoscopy may be of benefit to those with many or atypical moles.
People who have had a nonmelanoma or keratinocyte skin cancer (BCC or SCC) are at increased risk of further skin cancer, melanoma and internal cancers in the future. This risk is particularly marked in younger people and in people that have any form of immune deficiency or immune suppression.
http://www.dermnetnz.org/lesions/skin-cancer.html
People who have had a nonmelanoma or keratinocyte skin cancer (BCC or SCC) are at increased risk of further skin cancer, melanoma and internal cancers in the future. This risk is particularly marked in younger people and in people that have any form of immune deficiency or immune suppression.
http://www.dermnetnz.org/lesions/skin-cancer.html