Psoriasis | NIAMS

Psoriasis is an autoimmune disease, which means that your bodys immune system which protects you from diseases starts overacting and causing problems. If you have psoriasis, a type of white blood cells called the T cells become so active that they trigger other immune system responses, including swelling and fast turnover of skin cells.

Your skin cells grow deep in the skin and rise slowly to the surface. This is called cell turnover, and it usually takes about a month. If you have psoriasis, though, cell turnover can take only a few days. Your skin cells rise too fast and pile up on the surface, causing your skin to look red and scaly.

Some things may cause a flare, meaning your psoriasis becomes worse for a while, including:

Certain genes have been linked to psoriasis, meaning it runs in families.

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Psoriasis | NIAMS

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