[Viral-induced tumours and pre-malignant cutaneous diseases of the perianal region].

HPV-induced tumours and pre-malignant cutaneous diseases of the anal region are rare, without the exception of condylomata acuminata. Often imposing like an eczema (especially M. Bowen, M. Paget) the danger of mis-interpretation and thereby mis-therapy is great, so that they are not seldom diagnosed in the stage of malignant degeneration. A comparatively high rate of recurrence is caused by primarily insufficient (surgical) therapy, but also by secondary transformation of still unchanged dermal areas and by re-infection. Therefore after-care is indicated.