[Cutaneous paraneoplastic syndromes of the skin]

With paraneoplastic skin diseases, we distinguish between obligatory and facultative symptoms. These may be caused by the tumor via allergic or immunologic mechanisms, but mostly the mechanism is unclear (e.g. coincidental). After removal of the tumor, the signs and symptoms should disappear. It is important to avoid strong immunosuppressive treatment, because it may produce dissemination of the tumor.