Psoriasis.

THIS differs from lepra in the eruption being more irregular. The spots sometimes come out in thick clusters, and blend in various ways. Instead of appearing in distinct circular forms, as in leprosy, the patches are irregular, and of every size. Instead of one well. formed and thick scale, there are many small and thin ones. And instead of a depressed centre with rising edges, the surface is level. While leprosy is a circular dry tetter, this is an irregular dry tetter.
Treatment. Pyrogallic acid in ointment, 10 to 40 gr. to oz. Apply daily; it discolors the skin for a while. Chrysophanic acid in same strength is the best remedy known. It also discolors the skin and inflames the neighboring skin for a while. Recently the thyroid gland of the sheep has been used in five grain tablets three times daily as an internal medicine with much success.