Signs and Symptoms of psoriasis
Psoriasis is typically characterized by the formation of circular, red eruptions (papules) or plaques with a gray or silvery-white, dry scale on the skin. These eruptions or scales are noticed in a symmetrical pattern on the scalp, elbows, knees, lower back region and in the body folds such as the armpits. The joints (referred to as psoriatic arthritis), nails and genital areas may also be affected. Occasionally these plaques may be observed on the inner cheek or tongue.

Itching at the affected sites is a commonly noted symptom, which may or may not be associated with burning sensation or pain. A small point of bleeding may be noticed if the scales on the skin are pulled out. In case of psoriatic arthritis, joint pain is noted along with the signs and symptoms of the skin. The affected nails may display pits on the nail surface with accumulation of yellowish material under the nail plate or detachment of the nails.

Based on the appearance, psoriasis has been categorized as follows:

• Plaque-type psoriasis—This is the commonest type of psoriasis, characterized by scales on the skin.
• Guttate psoriasis—Small oval/tear drop-shaped papules.
• Pustular psoriasis—Pus-filled eruptions; these may be observed only in certain specific areas (localized) or spread over a wide area (generalized)
• Erythrodermic psoriasis—scales associated with reddening of the skin (erythema).^1–3