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A cutaneous disease, characterized by imbricated silvery scales, affecting only the superficial layers of the skin.

A common genetically determined, chronic, inflammatory skin disease characterized by rounded erythematous, dry, scaling patches. The lesions have a predilection for nails, scalp, genitalia, extensor surfaces, and the lumbosacral region. Accelerated epidermopoiesis is considered to be the fundamental pathologic feature in psoriasis.

A skin disease consisting in an eruption of circumscribed rounded patches of a red color covered with adherent white scales, occurring chiefly on the extensor surfaces of the elbows and knees, the scalp, and the back.

Chronic scaly disease of skin; very sensitive.

A dry, scaly eruption, similar to lepra.

A skin disease characterised by a rough scaly cuticle, generally accompanied by chaps and fissures.

A cutaneous affection, consisting of patches of rough, amorphous scales; continuous, or of indeterminate outline; skin often chappy. Psoriasis occurs under a considerable variety of forms. The surface, under the scales, is more tender and irritable than in lepra, which psoriasis, in some respects resembles. Dr. Willan has given names to eleven varieties of psoriasis: the chief of which are the Psoriasis gutta'ta, P. diffu'sa (one form of which is the Baker's Itch and Grocer's Itch; and another, the Washerwoman's Scall), the P. gyra'ta, and P. invetera'ta seu Psora a'gria. The treatment of irritable psoriasis must be antiphlogistic, with the internal use of the fixed alkalies, sulphur, &c. They do better without any local application. The more local and less inflammatory are ameliorated by emollient and soothing applications; or by slightly stimulating means, sea-bathing, the Ung. hydrarg. nitricooxyd., Ung. oxidi zinci, &c.

A skin-disease of many varieties, characterized by scaly red patches.

A common chronic inflammatory disease characterized by the occurrence of sharply circumscribed roundish patches of all sizes up to several inches in diameter which have an infiltrated base and are covered with whitish abundant scales.