Quotation from: Manual of Surgery

Written by: Alexander Miles and Alexis Thomson


_The cutaneous naevus_, "mother's mark," or "port-wine stain," consists
of an aggregation of dilated capillaries in the substance of the skin.
On stretching the skin the vessels can be seen to form a fine network,
or to run in leashes parallel to one another. A dilated arteriole or a
vein winding about among the capillaries may sometimes be detected.
These naevi occur on any part of the body, but they are most frequently
met with on the face. They may be multiple, and vary greatly in size,
some being no bigger than a pin-head, while others cover large areas of
the body. In colour they present every tint from purple to brilliant
red; in the majority there is a considerable dash of blue, especially in
cold weather.

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