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Updated: June 24, 2025
First, because its application usually involves licking it to make it stick; second, because it must cover a sufficient amount of skin on either side of the wound to give it firm grip, and this area of skin contains a considerable number of both sweat-ducts and hair-follicles, which will keep on discharging under the plaster, producing a moist and unhealthy condition of the lips of the wound.
From the subjacent tissues, which in the normal order have no concern with outward growth, there is produced a new skin, or rather a pro-skin; for this substituted outward-growing layer contains no hair-follicles or other specialities of the original one. Nevertheless, it is like the original one in so far that it is a continually renewed protective covering.
Throughout this feltwork structure which gradually passes into areolar tissue are numerous muscular fibers, as about the hair-follicles and the oil glands. When these tiny muscles contract from cold or by mental emotion, the follicles project upon the surface, producing what is called "goose flesh."
The compression of the scalp by a tight-fitting hat interferes with the local circulation, and may cause headaches, neuralgia, or baldness, the nutrition of the hair-follicles being diminished by the impaired circulation. The compression of the chest and abdomen by a tight belt and various binders interferes with the action of the diaphragm, the most important muscle of respiration.
Connected with the hair-follicles are small bundles of muscular fibers, which run obliquely in the skin and which, on shortening, may cause the hairs to become more upright, and thus are made to "stand on end." The bristling back of an angry cat furnishes a familiar illustration of this muscular action. Hair and Hair-Follicle.
The human embryo is, as a rule, entirely clothed with a thick coat of fine wool during the last three or four weeks of gestation. These permanent hairs grow out of hair-follicles, which are formed from the root-sheaths of the disappearing wool-fibres.
This is a group of cell-citizens of the highest rank, descended originally from the great primitive skin-sheet, which have formed themselves into chemical laboratories, ferment-factories for the production of the various secretions required by the body, from the simplest watery mucus, as in the mouth, or the mere lubricant, as in the fat-glands of the hair-follicles, to the most complex gastric or pancreatic juice.
Moreover, these sweat-ducts and hair-follicles will, as we have seen, frequently contain white staphylococci, which are at times capable of setting up a low grade of inflammation in the wound. A wound always heals better if its surfaces and coverings can be kept dry.
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