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62 that some cases have increased in area and that others have gradually disappeared, leaving atrophic scars, but such cases are notable exceptions to the rule.

Nævus tuberosus is a turgescent tumor of varying size with a rounded or flattened surface. It results from a congenital dilatation or new formation of blood vessels, and in color varies from a bright cherry-red to a purplish-red or leaden hue, according to the predominance of arterial or venous blood in the

31.—Nævus of nose.

tumor. It is frequently seen upon the scalp and face, although it may be found upon the trunk and extremities. It usually increases somewhat in size during the early months of infancy, and in some cases develops with such alarming rapidity that vigorous treatment is called for without delay. The tumor is usually elastic and compressible, and often varies in size and color at different times of day, and is especially prominent after a fit of crying or severe coughing. A distinct pulsation may