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History

A 28 year old teacher has a 9 month history of an intensely itchy rash over the flexural aspect of his right ankle.

The irritation is particularly troublesome in the evenings, and did not respond to hydrocortisone 1% cream. He is generally in good health, with no history of medical illness or previous skin problems, and there are no rashes anywhere else. There is a family history of psoriasis (father) but nobody else in his family has any skin problems.