Psoriasis is the result of a specific overactive immune response. This means that the immune system, whose job it is to protect you from threats such as bacteria, mistakenly attacks healthy tissue, in this case the skin. This causes the process of creating new skin to speed up and dead skin cells to build up on the skin’s surface. It is not known what causes this immune response, but the environment can often trigger flares. Psoriasis does run in families, so there is likely a genetic component to the disease, but this it is not fully understood. In this section, we look at the science behind the condition.
1 NHS. Overview Psoriasis. 2018. Available at: https://www.nhs.uk/conditions/psoriasis/. Last accessed June 2019