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Atrophic and bowenoid AK zones corresponded to the dented, band-like region and pinkish region, respectively. Collectively, the nodular skin lesion was diagnosed as SK associated with atrophic and bowenoid AK within the SK lesion. The present case suggests that bowenoid AK developed from SK by malignant transformation via three steps of histological change. The facts that our patient had received treatment with several immunosuppressants and that no other AK lesions were evident around the AK support the notion that in this case, bowen