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Psoriasis is a chronic autoimmune skin disorder that affects approximately 2-3% of the world's population. The exact cause of psoriasis is not fully understood, but it is believed to be a combination of genetic, environmental, and 长春牛皮癣医院指出， immune system factors.

One hypothesis suggests that psoriasis is triggered by a T cell-mediated immune response in the skin that leads to inflammation and abnormal skin cell growth. Normally, T cells help to fight off infections and foreign invaders, but in people with psoriasis, T cells mistake healthy skin cells for foreign invaders and attack them.

This leads to an overproduction of skin cells, which are rapidly produced and then pile up on the skin's surface, forming thick, scaly plaques. In addition to T cells, other immune cells such as dendritic cells and macrophages are also involved in the inflammatory process that leads to psoriasis.

There are also genetic factors that play a role in the development of psoriasis. Studies have identified several genes that are associated with psoriasis, including genes involved in the immune system and those that regulate skin cell growth and differentiation.

Environmental factors can also trigger or worsen psoriasis symptoms. These factors include stress, skin injuries, infections, and certain medications.

In conclusion, psoriasis is a complex disorder with multiple contributing factors. Understanding the underlying mechanisms of psoriasis can help clinicians develop personalized treatment plans for individuals with this condition.