It is hereditary and tends to run in families. It may be brought on, or made worse, by emotional factors, by injury or by infection. It may be mild or severe, be localised to one or two areas or generalised and affect the whole body. It may be stable and chronic or it may be unstable, rapidly flaring and active.
The treatment of psoriasis is well established although new treatments have been introduced for severe and resistant rashes.
Sufferers need to understand the aims and limitations of treatment, and the nature of their disease. The rash, being chronic and incurable, tends to come and go. It may be present unchanged for many years and the person comes to terms with it. Then it may suddenly clear, only to reappear months later.
Treatment may completely clear the rash but it will inevitably return as there is no permanent cure. But this shouldn’t discourage those who suffer from it, as control is possible.
It is uncommon on the face. Only one person in four with this condition will have it affect more than 5 per cent of the skin surface.