Pruritus of the anus is a general term denoting an intolerable itching of the anal and often the entire perineal region. I recognize two distinct forms—the distinction depending on whether the irritative cause is within or outside the zone in which the pruritus is felt. In the two forms the general character and location of the itching is identical, but the seat of the cause is not always within the area affected and often not in the perineal region at all.
Concerning that form in which a source of direct irritation to the nerve endings in the pruritic zone is evident, nothing will be said except that I believe it to be a distinct clinical entity, and like to refer to it as pruritus ani. We are, however, here concerned more particularly with the other form, which I designate with the term anal pruritus. In this form the causes at