Psoriasis is a common skin condition that causes skin redness and irritation. Most people with Psoriasis have thick, red skin with flaky, silver-white patches called scales.

    Psoriasis is a noncontagious skin condition that produces red, dry plaques of thickened skin. The dry flakes and skin scales are thought to result from the rapid proliferation of skin cells that is triggered by abnormal lymphocytes from the blood . Psoriasis commonly affects the skin of the elbows, knees, and scalp.


  • Psoriasis is very common. Anyone can get it.
  • It most commonly begins between ages 15 and 35.
  • It is not contagious. You cannot spread it to others.
  • Psoriasis seems to be passed down through families. Doctors think it probably occurs when the body's immune system mistakes healthy cells for dangerous substances.
  • Usually, skin cells grow deep in the skin and rise to the surface about once a month. In persons with Psoriasis, this process is too fast. Dead skin cells build up on the skin's surface.

    Some people with Psoriasis may also have arthritis, a condition known as psoriatic arthritis.

Causes and Risk factors

The following may trigger an attack of Psoriasis or make the condition more difficult to treat:

  • Bacteria or viral infections, including strep throat and upper respiratory infections

  • Dry air or dry skin
  • Injury to the skin, including cuts, burns, and insect bites
  • Some medicines, including antimalaria drugs, beta-blockers, and lithium
  • Stress
  • Too little sunlight
  • Too much sunlight (sunburn).
  • Too much alcohol.

In general, Psoriasis may be severe in people who have a weakened immune system. for e.g. in:

  • AIDS Scalp Psoriasis
  • Autoimmune disorders (such as rheumatoid arthritis)
  • Cancer chemotherapy

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