Mother's Marks. Naevus.
THE, small vessels of the skin, called capillaries, suffer certain alterations of structure which pass under the name of mother's marks. These marks are simply a great dilatation of these minute blood vessels. They vary in size from a mere point to a patch of several inches square.
The smallest of all is the spider mark. It is a small red point, from which several little straggling vessels spread out on all sides. Sometimes this is of the size and appearance of a red currant; at other times, of a strawberry or raspberry; and occasionally it is even much larger, and is compared to a lobster.
When the circulation is active through them, or the individual is excited by exercise, or by moral causes, these marks are of a bright red color. Some are naturally livid and dark colored, and look like blackberries, and black currants. The blueness of these is owing to the vessels being still more stretched and dilated, and to the consequent slower passage of the blood though them, which gives more time for its change from the arterial red to the venous blue.
Treatment. If the mark is not making progress, it had better be let alone, or only subjected to gentle pressure by putting a piece of soap plaster over it. When its course is threatening mischief, it is sometimes cured by penciling a small portion of its surface, from time to time, with nitric acid. They maybe operated on with safety by electrolysis and other methods.
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