An adequate and unified classification of vulvar pathology has been difficult and continues to be a problem hard to solve, due to the difficulties in including different clinical aspect in various pathological classes. The causes of this uncertainty, as rather a multiplicity of viewpoints, may be ascribed in particular to the extreme polymorphic nature of vulvar pathology. Our classification, in attempting to overcome arbitrary and absolute distinctions in such a polymorphic and variable field, adopts an etiological and anatomo-histological criterium which distinguishes vulvar pathology in: primary disorders, secondary disorders. It is evidently important to know and distinguish possible vulvar infections, in order to be able to identify those disorders which assume an oncogenous risk, while trying to overcome the problems of differential diagnosis.