—If a blister is to be applied to the head, shave it at least ten hours before it is put on; it is better to place a thin piece of gauze, wetted with vinegar, between the skin and the blister. If a distressing feeling be experienced about the bladder, give warm and copious draughts of linseed tea, milk, or decoction of quince seeds, and apply warm fomentations of milk and water to the blistered surface. The
period required
for a
blister
to remain on varies from eight to ten hours for adults, and from twenty minutes to two hours for children: as soon as it is removed, if the blister is not raised, apply a "spongio-piline" poultice, and it will then rise properly. When it is required to act as a rubefacient, the blister should remain on from one to three hours for adults, and from fifteen to forty minutes for children.
To dress a blister.
—Cut the bag of cuticle containing the scrum at the lowest part, by snipping it with the scissors, so as to form an opening like this—
V
; and then apply a piece of calico, spread with spermaceti or some other dressing. Such is the ordinary method; but a much better and more expeditious plan, and one that prevents all pain and inconvenience in the healing, is, after cutting the blister as directed above, to immediately cover it with a warm bread and water poultice for about an hour and a half, and on the removal of the poultice to dust the raw surface with violet powder; apply a handkerchief to retain the powder, and lastly dust the part every two hours. It will be healed in twelve hours.
Caution.