Psoriasis is an immune system disorder. The system goes into overdrive and causes the skin to grow too many cells. Symptoms usually onset between the ages of 15 and 30.For more videos, visit the Everyday Health Channel on YouTube:http://www.youtube.com/user/EverydayHealth/Check us out:http://www.everydayhealth.com/Find us on Facebook:http://www.facebook.com/everydayhealthFollow us on Twitter at:https://twitter.com/everydayhealthWe're on Pinterest:http://pinterest.com/everydayhealth/
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