Skin cancer is the most common malignancy arising in the posttransplantation setting. Multiple factors contribute to the high risk for cutaneous carcinoma in immunosuppressed organ-transplant recipients. We review the phenomenon of skin cancer in solid-organ transplant recipients and further delineate the problem in the context of liver transplantation. Skin cancer is a significant medical and surgical problem for organ-transplant recipients. With prolonged allograft function and patient survival, the majority of solid-organ transplant recipients will eventually develop skin cancer. Although squamous cell carcinoma is the most common cutaneous malignancy in this population, basal cell carcinoma, melanoma, and Kaposi's sarcoma, as well as uncommon skin malignancies, may occur. Highly susceptible patients may develop hundreds of squamous cell carcinomas, which may be life threatening. Management strategies focus on regular full-skin and nodal examination, aggressive treatment of established malignancies, and prophylactic measures to reduce the risk for additional photodamage and malignant transformation. Skin cancer is a substantial cause of morbidity and even mortality among solid-organ transplant recipients. As a byproduct of immunosuppression, liver transplant recipients experience a high incidence of skin cancer and should be educated and managed accordingly. (Liver Transpl 2000;6:253-262.) S kin cancer is the most common malignancy occurring in the setting of solid-organ transplantation and immunosuppression. The incidence of skin cancer increases substantially with extended survival after organ transplantation. Although for many patients, the cutaneous malignancies that arise are easily managed, there is a distinct subset of patients for whom major morbidity and even mortality may occur.Fortunately, skin cancer is a potentially preventable malignancy, and efforts increasingly are being directed to primary prevention in addition to treatment of skin cancers. Because the majority of organ-transplant recipients eventually develop skin cancer, it behooves the transplant physician and team to be knowledgeable about the early recognition of these lesions. Prompt referral to a dermatologist expert in the management of these patients is essential to minimize morbidity and occasional mortality.This review summarizes the skin cancer epidemic, the phenomenon of skin cancer in the setting of solid-organ transplantation, etiologic factors, and the recognition, management, and prevention of this substantial complication of transplantation-associated immunosuppression.