Exorex lotion has been launched on prescription in the UK. It was developed after a South African psoriasis sufferer, Piet Meyer, noticed that Zulus traditionally used banana peel to treat skin problems.

He experimented to see whether banana pulp could relieve his psoriasis - and found that it did.

Range of products

Mr Meyer then teamed up with a pharmacist, Steven Zall, to isolate the active ingredient - essential fatty acid. They went on to formulate the Exorex range of lotions, creams, soap and shampoo.

Zulus were the first to discover the benefits

In a study of 53 patients, Exorex was shown to bring an 86% average improvement of symptoms.

A total of 29 patients went into remission within the three-month study period.

"Unlike some other treatments for psoriasis, Exorex does not burn or stain the skin," said a spokesman.

"It is non-greasy, has no strong odour, and is absorbed into the skin, making it pleasant to use."

Unsightly lesions

Psoriasis produces unsightly lesions on the surface of the skin and affects one in 50 of the population. It can appear at any age, and disappear spontaneously.