Skin carcinomas account for 95% of all skin cancers in transplant recipients and are the most frequent cancers after transplantation, affecting in the long term 50% of patients. The interval between a transplantation and the occurrence of a carcinoma is on average 8 to 10 years, but is shorter in older patients. The relative risk is higher for squamous cell carcinoma (x100) than for basal cell carcinoma (x10). Carcinomas are located on sunexposed areas and are often associated with other dysplastic lesions, premalignant keratoses or Bowen’s disease. Most transplant recipients who have a squamous cell carcinoma, develop multiple new skin tumours within 5 years, requiring multiple treatments. Risk factors include mainly sun exposure, fair skin type and light eyes, aging and immnunosuppressive treatments. Prevention consists of strict sun protection and early treatment of premalign lesions.