On the basis of our clinical experience and a careful revision of the literature, we have attempted to identify the natural history of vulvar carcinoma by verifying the real evolutive possibility of these lesions, their possible genesis, the latent period between pre-invasive and invasive forms, and some events which seem to play a significant role in the onset of the invasive form in this period. These considerations indicate a new clinical and study approach to carcinoma in situ, which would thus become a pathology characterized by a more precise pathogenetic and evolutive individuality.