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Psoriasis is a chronic autoimmune disorder that affects the skin. The skin cells divide rapidly and form layers of a thick, red, itchy rash and silver-colored scales. People with psoriasis often cycle through flare-ups and remissions. Though scientists have not found a cure, understanding the causes of psoriasis may help limit occurrences.

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1. Genetics

The consensus in the medical world is that genetics is a vital factor in psoriasis, although the mechanism is not well understood. Almost 33% of people with psoriasis report a family history of the skin condition, and there is a 66% to 90% chance of it appearing in both identical twins.

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