Psoriasis is characterised by sharply defined, red patches of skin which soon become covered with thickened areas of dry, silvery scales.

The condition is not infectious and is due to an abnormally rapid cycle of skin-cell growth and shedding.

Psoriasis can affect any part of the body, but occurs mainly on the knees and elbows, on the scalp and sometimes on the back or chest. It may also affect the fingernails, which can become disfigured.

Click to view photos of this condition

The overall aim of treatment is to reduce the activity of the skin cells and relieve the associated inflammation.

Although psoriasis may recur, it can be managed with ongoing treatment. Once a successful treatment has been established, it should be resumed at the first sign of recurrence.

Avoid soap, as this can exacerbate the condition. Bathing in solutions containing tar can be helpful in relieving symptoms and maintaining clearance. 

Try to avoid stress, as well as cuts, burns or infections on the affected area, as this can provoke a flare-up of the condition.