Major skin diseases, including acne, psoriasis and eczcma, affect the majority of the population at some time in their lives. In general, these diseases are physically and psychologically disfiguring for the sufferers; furthermore, by their very chronic nature skin diseases, unlike most other disease processes, present both acute and chronic therapy problems. In addition, the chronic nature of these diseases can present certain economic problems. Firstly, chronic therapy is becoming increasingly expensive and secondly, patients adhering to a strict treatment regimen will frequently be absent...