Psoriasis is a common chronic, relapsing, non-contagious skin disorder characterised by red patchy lesions, with grey or silvery-white, dry scales, which are frequently painful, itchy and may bleed. Lesions are typically distributed symmetrically on the scalp, elbows, knees and essentially any part of the body. It is a disease with an unpredictable course, prone to flare-ups and remissions, and which can affect the joints, nails and eyes [1, 2]. Psoriasis is found worldwide but the prevalence varies among different ethnic groups. It affects 1-5% of Europeans overall, with rates as high as 6% in France and Germany. In the UK, it is the 3rd most common dermatological disease, affecting approximately 1-2% of the population; this equates to approximately 1.2 million people and accounts for 10-20% of visits to a hospital dermatology unit [1, 3, 4]. It can afflict both men and women, and usually begins in early adulthood although it has been reported at birth. The mean age of onset for the first presentation of psoriasis can range from 15-20 years of age, with a second peak occurring between ages 55-60 years.