Inclusion Criteria:  Written consent Colposcopy performed preoperatively Histologically (by previously performed colposcopy) confirmed dysplasia (CIN 1, CIN 2 or CIN 3) Age >18 years  Exclusion Criteria:  Pregnant patients Patients with insufficient knowledge of the German language Treatments already performed on the cervix uteri, in particular conization Blood coagulation disorders Taking blood thinning substances Iodine allergy