What is psoriasis?
Psoriasis is a chronic (long-lasting) skin disease that causes raised, red patches on your skin. The raised patches may have silvery scales.
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Psoriasis is common and can run in families
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People with light skin get psoriasis more often than people with dark skin
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Psoriasis usually starts when you're between ages 16 and 22 years or between ages 57 and 60 years
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The patches can be large or small, and they can appear anywhere on your body, especially your elbows, knees, and scalp
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Psoriasis can’t be cured, but the patches can go away for long periods of time and then come back
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Doctors treat psoriasis with phototherapy (shining a UV light on your skin to heal it) and medicine
What causes psoriasis?
Doctors aren’t sure exactly what causes psoriasis. It may be a problem with your immune system (the cells, tissues, and organs that protect your body from illness and infection). Psoriasis tends to run in families. That means if you have psoriasis some of your relatives may also have psoriasis.
Flare-ups
Psoriasis tends to come and go, although some patches may never go away. Flare-ups are when it comes back or gets worse. Flare-ups can be triggered by:
Flare-ups are more common for people who are overweight, smoke tobacco, or have HIV infection.
