This section is from the book "The Home Hand-Book of Domestic Hygiene and Rational Medicine. Volume 2.", by J. H. Kellogg, M.D.. Also available from Amazon: The Home Hand-Book of Domestic Hygiene and Rational Medicine, Volume 2.
In this condition, the perinaeum, or portion of the tissue between the vagina and rectum, does not dilate as it should, but the central portion bulges forward while the upper edge remains hard and unyielding. This is the most frequent cause of rupture of the perinaeum. The best remedies are the hot sitz bath and hot fomentations to the parts. A very excellent way of applying moist heat is by means of a large sponge dipped in hot water, and applied as hot as it can be borne. The hot-water douche and the hot enema are remedies of very great value. The employment of daily sitz baths during the later months of pregnancy is a very excellent means of preventing this complication.