Psoriasis occurs when skin cells are replaced more quickly than usual. It's not known exactly why this happens, but research suggests it's caused by a problem with the immune system.
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Psoriasis is thought to be caused by a problem with the immune system, which causes your body to make too many skin cells.
Mild psoriasis can be treated with creams and ointments. If these do not work, you may need light treatment (phototherapy) or stronger medicines.
Page last reviewed: 09/05/2018
Next review due: 09/05/2021