#Give the symptoms of seborrh[oe]a sicca.#
A variable degree of greasy scalines, which may be seated upon a pale, hyperæmic or mildly inflammatory surface.
The parts affected are covered scantily or more or less abundantly with somewhat greasy, grayish, or brownish-gray scales. If upon the scalp (_dandruff_, _pityriasis capitis_), small particles of scales are found scattered through the hair, and when the latter is brushed or combed, fall over the shoulders. If upon the face, in addition to the scaliness, the sebaceous ducts are usually seen to be enlarged and filled with sebaceous matter.
#Describe the symptoms of the ordinary or mixed type.#
It is common upon the scalp. The skin is covered with irregularly diffused, greasy, grayish or brownish scales and crusts, in some cases moderate in quantity, in others so great that large irregular masses are formed, pasting the hair to the scalp. If removed, the scales and crusts rapidly re-form. The skin beneath is found slate-colored, hyperæmic or mildly inflammatory, and exceptionally it has in places an eczematous aspect (_eczema seborrhoicum_). Extraneous matter, such as dust and dirt, collects upon the parts, and the whole mass may become more or less offensive. There is a strong tendency to falling-out of the hair. Itching may or may not be present.
[Illustration: Seborrh[oe]a (Eczema Seborrhoicum).]
#Describe the symptoms of seborrh[oe]a of the trunk and other parts.#
[Illustration: 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.]
Seborrh[oe]a corporis differs in a measure, in its symptoms, from seborrh[oe]a 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.