Psoriasis

Psoriasis is a chronic, non-contagious autoimmune disease which affects the skin and joints. It commonly causes red scaly patches to appear on the skin.

The scaly patches caused by psoriasis, called psoriatic plaques, are areas of inflammation and excessive skin production.
Skin rapidly accumulates at these sites and takes on a silvery-white appearance. Plaques frequently occur on the skin of the elbows and knees, but can affect any area including the scalp and genitals. Psoriasis is a prolonged inflammation of skin.
The causes of psoriasis are still unclear. This condition is neither infectious (Does not spread from one person to another) nor does it affect the general health.
It affects both the genders and may start at any age.
Psoriasis is quite common, affecting around two per cent of the population, although people with very mild symptoms may not be aware they have it. Psoriasis can begin at any age but usually starts either around the age of 20 or between 50 and 60.
The disorder is a chronic recurring condition which varies in severity from minor localized patches to complete body coverage. Fingernails and toenails are frequently affected (psoriatic nail dystrophy) and can be seen as an isolated finding.
Psoriasis can also cause inflammation of the joints, which is known as psoriatic arthritis. In contrast to eczema, psoriasis is more likely to be found on the extensor aspect of the joint.