Selected monographs on dermatology / P.G. Unna [and others].

Date:
1893
Catalogue details

Licence: Public Domain Mark

Credit: Selected monographs on dermatology / P.G. Unna [and others]. Source: Wellcome Collection.

    589/636 (page 571)
    IN PSORIASIS.1 The nature of the efflorescence.—Hyperemia is the first thing we notice clinically in the development of an efflores- cence ; the production of scales is a later feature. In addi- tion to the frequent brown pigmentation seen especially after arsenic treatment,2 leucoderma has sometimes ap- peared in the site of the efflorescence. This has also been observed after arsenic and large doses of iodide of potassium. The spots of leucoderma are usually quite small, but in some patients the patches are extensive, and have persisted un- changed for some months (at least six months). Localisation.—The distribution of psoriasis in 862 cases was as follows :—On the trunk, extremities, and head, 489 times ; on the trunk and extremities, 197 times ; on the ex- tremities only, 113 times; on the extremities and head, 53 times; on the head only, 5 times; on the trunk and head, 4 times ; and on the trunk alone, only once. Thus we see that limitation of the eruption to the trunk only is very rare indeed, and it is probable that this soli- 1 The present paper is an abridged extract of a larger work (' Contribution to our Knowledge of Psoriasis,' Copenbagen, 1892, pp. 204, fifty-seven histories of cases, with index of literature), which I compiled during my three years' tenure of office as Secundararzt at the General Hospital in the Department for Skin and Venereal Diseases (Prof. Haslund), from 927 cases of psoriasis (616 patients), extending over a period of twenty-five years, and from forty-three private patients in the practice of Prof. Bergh. 2 In a case of Addison's disease dark brown pigmentation persisted after the spontaneous disappearance of the eruption.