Psoriasis

Definition

Psoriasis is a common skin condition that causes skin redness and irritation. Most persons with psoriasis have thick, red skin with flaky, silver-white patches called scales.

See also: Guttate psoriasis

Symptoms

Persons with psoriasis have irritated patches of skin. The redness is most often seen on the elbows, knees, and trunk, but can appear anywhere on the body. For example, there may be flaky patches on the scalp.

The skin patches or dots may be:

• Dry and covered with silver, flaky skin (scales)
• Pink-red in color (like the color of salmon)
• Raised and thick

Other symptoms may include:

• Genital lesions in males
• Joint pain or aching (psoriatic arthritis)
• Nail changes, including nail thickening, yellow-brown spots, dents (pits) on the nail surface, and separation of the nail from the base
• Severe dandruff on the scalp

Psoriasis may affect any or all parts of the skin. There are five main types of psoriasis:

• Erythrodermic -- The skin redness is very intense and covers a large area.
• Guttate -- Small, pink-red spots appear on the skin.
• Inverse -- Skin redness and irritation occurs in the armpits, groin, and in between overlapping skin.
• Plaque -- Thick, red patches of skin are covered by flaky, silver-white scales. This is the most common type of psoriasis.
• Pustular -- White blisters are surrounded by red, irritated skin.

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