Seborrhœa (Eczema Seborrhoicum).
Describe the symptoms of seborrhœa of the trunk and other parts.
Fig. 7.
A normal sebaceous gland in connection with a lanugo hair. (After Neumann.)
a, Capsule; b, fatty secretion; c, h, secreting cells; d, root of lanugo hair; e, hair-sac; f, hair-shaft; g, acini of sebaceous gland.
Seborrhœa corporis differs in a measure, in its symptoms, from seborrhœa of the scalp and is usually illustrative of the variety known as eczema seborrhoicum; it occurs as one or several irregular or circinate, slightly hyperæmic or moderately inflammatory patches, covered with dirty or grayish-looking greasy scales or crusts, usually moderate in quantity, and upon removal are found to have projections into the sebaceous ducts. It is commonly seen upon the sternal and interscapular regions. It rarely exists independently in these regions, being usually associated with and following the disease on the scalp. It may also invade the axillæ, genitocrural, and other regions.
What is the usual course of seborrhœa?
Essentially chronic, the disease varying in intensity from time to time. In occasional instances it disappears spontaneously.