Plaque psoriasis is the most common form of psoriasis. It is characterized by raised, inflamed (red) lesions covered with a silvery white scale. The scale is actually a buildup of dead skin cells. The technical name for plaque psoriasis is psoriasis vulgaris (vulgaris means common).
Plaque psoriasis may appear on any skin surface, though the knees, elbows, scalp, and trunk are the most common locations. Sometimes the patches of infected skin are large, extending over much of the body. The patches, known as plaques or lesions, can wax and wane but tend to be chronic. These can be very itchy and if scratched or scraped they may bleed easily. The plaques usually have a well-defined edge and, while they can appear anywhere on the body, the most commonly affected areas are the scalp, knees and elbows. However, if the scalp is involved, you may develop psoriasis on the hairline and forehead. The actual appearance of the plaques can depend on where they are found on the body. Plaques found on the palms and soles can be scaly, however they may not be very red in color. This is due to the thickness of the skin at these sites. If the plaques are in moist areas, such as in the creases of the armpits or between the buttocks, there is usually little or no scaling. The patches are red and have a well-defined border. Chronic (or common) plaque psoriasis affects over 90% of sufferers. It appears usually on the scalp, lower back, elbows, arms, legs, knees and shoulders. It is very much an adult condition.
