Temporary and Partial Canities.--Of special interest are those
cases in which whiteness of the hair is only temporary. Thus,
Compagne mentions a case in which the black hair of a woman of
thirty-six began to fade on the twenty-third day of a malignant
fever, and on the sixth day following was perfectly white, but on
the seventh day the hairs became darker again, and on the
fourteenth day after the change they had become as black as they
were originally. Wilson records a case in which the hair lost its
color in winter and regained it in summer. Sir John Forbes,
according to Crocker, had gray hair for a long time, then
suddenly it all turned white, and after remaining so for a year
it returned to its original gray.
Grayness of the hair is sometimes only partial. According to
Crocker an adult whose hair was generally brown had a tuft of
white hair over the temple, and several like cases are on record.
Lorry tells us that grayness of one side only is sometimes
occasioned by severe headache. Hagedorn has known the beard to be
black in one place and white in another. Brandis mentions the
hair becoming white on one side of the face while it continued of
its former color on the other. Rayer quotes cases of canities of
the whole of one side of the body.
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