Psoriasis remains a disease of unknown aetiology. It is common, has a chronic course with exacerbations and remissions, and may present at any age. There are a number of clinical types recognized and an association with arthritis has been noted. Treatment is directed at control of the disease to enable the person to live and cope with his disease state. This can often be achieved with topical therapy, but it may at times require hospitalization. More severe forms of psoriasis may require potentially dangerous medication.
