[How I explore...a skin tumor in a transplant patient]

Immunosuppressive therapy associated with organ transplant leads to an increased risk to develop skin cancers. In such circumstances, squamous cell carcinomas and basal cell carcinomas represent the most frequent tumors. Other neoplasms include malignant melanoma, Merkel cell carcinoma and Kaposi disease. Histopathology is primordial in the establishment of the diagnosis. In addition, bioengineering devices and skin imaging methods are useful in establishing the risk of cancers and for detecting incipient tumoral lesions.