The case to be described, which has been under my observation for about two years, presents certain abnormalities of pigmentation together with a mild degree of lichenification. In the present instance, the two conditions appear to be associated only, without any evident etiologic connection. As Lindberg1 observed, an etiologic connection between leukoderma and many pathologic conditions has been implied, simply because the latter have been found in many patients presenting leukoderma.
REPORT OF CASE
History.—
A stenographer, aged 18, of Canadian birth and parentage, first seen in April, 1926, complained of spots on the back of the neck and on the thorax which were discolored, rough and itchy. It was learned that since early childhood light-colored areas surrounded by skin of a deeper color than normal had been appearing on different parts. Some disappeared and others persisted. One of these which had been present for a long time was