Setons are introduced by pinching up a fold of the skin, and pushing a needle through it armed with a skein of silk or cotton, or a long flat piece of Indian-rubber. As soon as one or two inches of the thread are drawn through, the needle is cut off. A fresh portion of the thread is to be pulled through the wound every day, so as to keep up a constant irritation and discharge. The wound may be dressed night and morning with Spermaceti Ointment spread on lint; which may be kept in its place by strips of sticking plaister.

If the discharge is not sufficient, a little yellow basilicon may be spread on the thread before it is drawn through the skin.