Psoriasis is a chronic skin disease which gives symptoms as redness at where the disease settled and emerges at intervals. Upper layer of the skin gets thicken and grown, then white-silver patches appear. Skin begins to regeneration in every few days. Thickness of the layer of dead cells on the skin is increased.
Although there may be several symptoms on multiple areas of the body, symptoms are predominantly seen on elbow, knee, scalp, lumbar area and nails. Course of disease can be moderate in some patients, while it can be severe in other patients.

Psoriatic redness and crusting may occur on multiple areas of the body. Lesions are a kind of problem which are curable. Incidence of psoriasis is 2% in average. This figure demonstrates how much the disease is common. Psoriasis is more like to occur among early ages.

Presence of psoriasis among the family increase the predisposition to psoriasis in other family members. In addition, psoriasis is a contagious disease, since it is not caused by microorganisms.