Seven colposcopic signs (acetic acid staining--borders--thickness--surface contour--colour--vascular atypias--iodine staining) are examined in differential diagnosis between condyloma and CIN. For a better prognostic and therapeutic approach, we think it is useful to follow a diagnostic path whose main steps are: colposcopy, cytology, microcervicoscopy, histology. With the introduction of sophisticated diagnostic techniques (molecular hybridization--morphology cells study--chromosomes map study) it is possible to determine morphologically the observed lesion and predict, as much as possible, the following evolution.