Psoriasis is a very common condition. The disorder may affect people of any age, but it most commonly begins between ages 15 and 35.
The condition cannot be spread 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. See also: Inflammatory response
Skin cells grow deep in the skin and normally rise to the surface about once a month. In persons with psoriasis, this process is too fast (about 2 weeks instead of 4 weeks) and dead skin cells build up on the skin's surface.
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. This may include persons who have:
AIDS
Autoimmune disorders (such as rheumatoid arthritis)
Cancer chemotherapy
Up to one-third of people with psoriasis may also have arthritis, a condition known as psoriatic arthritis.
http://www.ncbi.nlm.nih.gov/pubmedhealth/PMH0001470/
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