Psoriasis (IPA pronunciation: [s?'ra?.?s?s]) is an immune-mediated disease[1] which affects the skin and joints. It commonly causes red scaly patches to appear on the skin. The scaly patches caused by psoriasis are often called psoriasis plaques or lesions.

  1. Generally, the skin of the person suffering from the disease appears and irritated and may be covered with bright silvery scales.
  2. Sometimes there is also a little itching .The areas usually involved are the elbows, knees, the skin behind the ears, the trunk, and the scalp.
  3. The disease may also affect the underarms and genital areas. The lesions vary in size from minute papules to sheets covering large parts of the body.
  4. Quite often they are discs from half an inch to several inches in size. The lesions are always dry and rarely become infected.