FRAGILITAS CRINIUM

973

ATROPHIA PILORUM PROPRIA¹

Synonym.—Atrophy of the hair.

Atrophy of the hair is a general term employed to cover various
varieties of hair changes, of an atrophic or destructive character, which
may be due to the invasion of parasites in the hair or about the hair-
roots, or which may result from some known or unknown general sys­
temic conditions from which the hair, as well as other tissues or organs,
may suffer partial nutritive starvation, and thus become weakened and
fragile. It is not improbable, however, that even those considered tropho-
neurotic in origin may be so only so far as it weakens the hair and makes
it an easy prey and lodging-place for microbic elements. It is usual to
divide the cases into those idiopathic in origin and those symptomatic,
but it is purely an arbitrary division, and practically signifies that
those belonging to the former class are without recognizable cause, while
the latter class includes those apparently due to constitutional disease,
such as phthisis, fevers, syphilis, diabetes, and the like, and to such local
affections as favus, ringworm, seborrhea, etc The various conditions
found are commonly known as fragilitas crinium, trichorrhexis nodosa,
monilethrix, piedra, tinea nodosa, Beigel’s disease (chignon fungus),
and lepothrix. It is the first three, however, which are usually included
under the above heading, the others being characterized by concretions
upon the hair-shafts, although some resulting atrophy is generally
noticeable.

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