Diagnosis is usually done with a careful examination of the anus and the patient's history. If the presentation or physical findings are atypical, biopsies can be done. In case of long-lasting symptoms, above all in patients over 50 years of age, a colonoscopy is useful to rule out a colonic polyp or tumor, that can show<unk>  as first symptom.
Pruritus ani
Pruritus vulvae
Pathergy
Oral galvanism
Petechia
Crepitus
Parosmia
Prurigo nodularis