Psoriasis is relatively common and affects 2-3% of the U.K. population. Typically, psoriasis is considered to be a long-term issue, which means it’s what’s known as a chronic condition.

While the presentation of the condition is different in each individual, psoriasis patches commonly appear on the knees, elbows and scalp. It can be itchy and painful, and can also cause joint problems, known as psoriatic arthritis.

As a result of the chronic, uncomfortable and sometimes unpredictable nature of the condition, many patients find that it negatively impacts their quality of life and self-confidence. For these reasons, as well as its unsightly presentation, it is common for patients suffering from psoriasis – especially in its more severe forms – to also experience psychological issues, such as depression and anxiety.

The process becomes an ongoing cycle, in which new skin cells move to the outermost layer of skin too quickly — in days, rather than weeks. Skin cells build up in thick, scaly patches on the skin’s surface, continuing until treatment stops the cycle.

There are few ‘proven’ triggers for psoriasis, although patients often report flare-ups associated with stress, alcohol, infections and certain medications.

The condition is seen as likely to be influenced by genetics, so it is possible that if an individual’s parents have experienced problems with psoriasis, they may be more likely to have the same trouble.

Different types of psoriasis may have different causes, for example: